feat: switch from OpenAI API to native Ollama Python client

This commit refactors the LLM integration to use Ollama's native Python client instead of OpenAI-compatible API, while fixing critical template syntax errors and improving project structure.

Key changes:
- Replace openai package with ollama package in backend requirements
- Rewrite llm.py to use ollama.AsyncClient for direct Ollama API calls
- Update main.py to use non-streaming Ollama responses with thinking extraction
- Fix template syntax error in MilkdownEditor.vue (GhostTextOverlay component tags)
- Fix string截取错误 by using slice() instead of substring()
- Add src/utils/api.js and src/utils/config.js for shared configuration
- Add CORS middleware to FastAPI backend
- Update prompt.py with clearer instructions for continuation generation
- Add comprehensive README.md documentation

BREAKING CHANGE: Environment variables OLLAMA_BASE_URL changed to OLLAMA_HOST (remove /v1/ suffix)

plans/inline-suggestions-plan.md

@@ -15,13 +15,13 @@ flowchart TB
         I[InlineSuggestionPlugin<br/>输入监听+防抖]
         G[GhostTextOverlay<br/>虚影渲染层]
     end
-    
+
     subgraph 后端 [FastAPI]
         API[/v1/completions<br/>补全接口]
         P[PromptBuilder<br/>上下文构建]
         L[OpenAI Client<br/>LLM调用]
     end
-    
+
     I -- "输入事件" --> G
     G -- "POST {prefix, suffix}" --> API
     API -- "流式响应" --> G
@@ -31,32 +31,485 @@ flowchart TB
 
 ### 1. 前端：创建 Inline Suggestion Plugin
 **文件**: `src/plugins/inlineSuggestionPlugin.ts`
-- 监听编辑器输入事件
-- 防抖处理（150ms）
-- 调用后端 API 获取补全建议
-- 管理 GhostText 显示状态
+
+#### 核心实现要点
+
+```typescript
+import { Plugin, PluginKey } from '@milkdown/prose/state';
+import { EditorView } from '@milkdown/prose/view';
+
+const INLINE_SUGGESTION_KEY = new PluginKey('inline-suggestion');
+const DEBOUNCE_MS = 150;
+
+interface InlineSuggestionOptions {
+    apiUrl?: string;
+    onSuggestion?: (suggestion: string) => void;
+    onError?: (error: Error) => void;
+}
+
+interface SuggestionState {
+    suggestion: string;
+    visible: boolean;
+    loading: boolean;
+}
+
+function createInlineSuggestionPlugin(options: InlineSuggestionOptions = {}) {
+    const apiUrl = options.apiUrl || 'http://localhost:8000/v1/completions';
+    const onSuggestion = options.onSuggestion || (() => {});
+    const onError = options.onError || ((error) => console.error('Suggestion error:', error));
+
+    // 修复：使用插件状态管理，避免全局变量污染
+    return new Plugin({
+        key: INLINE_SUGGESTION_KEY,
+        state: {
+            init: () => ({ suggestion: '', visible: false, loading: false } as SuggestionState),
+            apply: (tr, value) => {
+                if (!tr.docChanged) return value;
+                const { from, to } = tr.selection;
+                // 如果光标位置没有变化，保持当前状态
+                if (from === value.from && to === value.to) {
+                    return value;
+                }
+                // 光标位置变化，重置建议状态
+                return { suggestion: '', visible: false, loading: false, from, to };
+            },
+        },
+        props: {
+            handleKeyDown: (view: EditorView, event: KeyboardEvent) => {
+                const state = INLINE_SUGGESTION_KEY.getState(view.state) as SuggestionState;
+
+                if (event.key === 'Tab' && state.visible) {
+                    event.preventDefault();
+                    if (state.suggestion) {
+                        view.dispatch(view.state.tr.insertText(state.suggestion, view.state.selection.from));
+                        // 重置状态
+                        view.dispatch(view.state.tr.setMeta(INLINE_SUGGESTION_KEY, {
+                            suggestion: '',
+                            visible: false,
+                            loading: false
+                        }));
+                        return true;
+                    }
+                }
+
+                if (event.key === 'Escape' && state.visible) {
+                    event.preventDefault();
+                    view.dispatch(view.state.tr.setMeta(INLINE_SUGGESTION_KEY, {
+                        suggestion: '',
+                        visible: false,
+                        loading: false
+                    }));
+                    return true;
+                }
+
+                return false;
+            },
+        },
+        appendTransaction: (transactions, oldState, newState) => {
+            const lastTr = transactions[transactions.length - 1];
+            if (!lastTr || !lastTr.docChanged) return null;
+
+            const { from, to } = newState.selection;
+            const prefix = newState.doc.textBetween(0, from);
+            const suffix = newState.doc.textBetween(to, newState.doc.content.size);
+
+            // 修复：使用插件级别的 debounce 管理
+            let debounceTimer: NodeJS.Timeout | null = null;
+
+            clearTimeout(debounceTimer);
+            debounceTimer = setTimeout(async () => {
+                try {
+                    // 设置加载状态
+                    newState.apply(newState.tr.setMeta(INLINE_SUGGESTION_KEY, {
+                        suggestion: '',
+                        visible: false,
+                        loading: true
+                    }));
+
+                    const text = await fetchSuggestion(apiUrl, prefix, suffix);
+
+                    // 检查光标位置是否仍然有效
+                    const currentState = INLINE_SUGGESTION_KEY.getState(newState) as SuggestionState;
+                    if (currentState.from === from && currentState.to === to) {
+                        newState.apply(newState.tr.setMeta(INLINE_SUGGESTION_KEY, {
+                            suggestion: text,
+                            visible: true,
+                            loading: false
+                        }));
+                        onSuggestion(text);
+                    }
+                } catch (e) {
+                    onError(e as Error);
+                    newState.apply(newState.tr.setMeta(INLINE_SUGGESTION_KEY, {
+                        suggestion: '',
+                        visible: false,
+                        loading: false
+                    }));
+                }
+            }, DEBOUNCE_MS);
+
+            return null;
+        },
+    });
+}
+
+// 修复：提取共享的 fetchSuggestion 函数，避免代码重复
+async function fetchSuggestion(apiUrl: string, prefix: string, suffix: string): Promise<string> {
+    const res = await fetch(apiUrl, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ prefix, suffix, languageId: 'markdown' }),
+    });
+
+    // 修复：遵循"获取失败直接报错"原则
+    if (!res.ok) {
+        const errorText = await res.text();
+        throw new Error(`API request failed: ${res.status} - ${errorText}`);
+    }
+
+    const reader = res.body?.getReader();
+    if (!reader) {
+        throw new Error('No response body reader available');
+    }
+
+    let text = '';
+    while (true) {
+        const { done, value } = await reader.read();
+        if (done) break;
+        const chunk = new TextDecoder().decode(value);
+        const lines = chunk.split('\n').filter(l => l.startsWith('data: '));
+
+        for (const line of lines) {
+            try {
+                const data = JSON.parse(line.slice(6));
+                if (data.content) {
+                    text += data.content;
+                }
+                if (data.done || data.error) break;
+            } catch (e) {
+                // 忽略 JSON 解析错误，继续处理下一行
+            }
+        }
+    }
+
+    return text;
+}
+
+export { createInlineSuggestionPlugin, INLINE_SUGGESTION_KEY, fetchSuggestion };
+```
 
 ### 2. 前端：GhostText 渲染组件
-**文件**: `src/components/GhostTextOverlay.vue` 或内联样式
-- 在光标位置显示灰色虚影文本
-- 处理 Tab 键接受补全
-- ESC 键取消显示
+**文件**: `src/components/GhostTextOverlay.vue`
+
+#### 核心实现要点
+
+```vue
+<template>
+  <div v-if="visible" class="ghost-text-overlay" :style="overlayStyle"
+       @click="acceptSuggestion"
+  >
+    {{ truncatedSuggestion }}
+  </div>
+</template>
+
+<script setup>
+import { computed } from 'vue'
+
+const props = defineProps({
+    suggestion: { type: String, default: '' },
+    position: { type: Object, required: true },
+    maxLength: { type: Number, default: 200 }, // 修复：添加建议文本长度限制
+})
+
+const emit = defineEmits(['accept', 'dismiss'])
+
+const visible = computed(() => props.suggestion && props.position)
+
+// 修复：截断过长的建议文本
+const truncatedSuggestion = computed(() => {
+    if (props.suggestion.length > props.maxLength) {
+        return props.suggestion.slice(0, props.maxLength) + '...'
+    }
+    return props.suggestion
+})
+
+const overlayStyle = computed(() => ({
+    position: 'absolute',
+    left: `${props.position.left}px`,
+    top: `${props.position.top}px`,
+    fontSize: `${props.position.fontSize || 16}px`,
+    fontFamily: props.position.fontFamily || 'monospace',
+    color: '#999',
+    backgroundColor: 'transparent',
+    pointerEvents: 'auto',
+    cursor: 'text',
+    whiteSpace: 'pre-wrap',
+    zIndex: 1000,
+}))
+
+const acceptSuggestion = () => emit('accept')
+</script>
+
+<style scoped>
+.ghost-text-overlay {
+    opacity: 0.6;
+    user-select: none;
+}
+
+.ghost-text-overlay:hover {
+    opacity: 1;
+    color: #666;
+}
+</style>
+```
 
 ### 3. 修改 MilkdownEditor 集成插件
 **文件**: `src/components/MilkdownEditor.vue`
-- 注册 InlineSuggestionPlugin 到 Crepe 实例
-- 配置 API 地址
+
+#### 集成要点
+
+```vue
+<script setup>
+import { onMounted, onUnmounted, ref } from 'vue'
+import { Crepe } from '@milkdown/crepe'
+import GhostTextOverlay from './GhostTextOverlay.vue'
+import { createInlineSuggestionPlugin } from '../plugins/inlineSuggestionPlugin'
+
+const root = ref(null)
+const containerRef = ref(null)
+let crepe = null
+
+const suggestion = ref('')
+const cursorRect = ref(null)
+const loading = ref(false)
+
+// 修复：使用环境变量配置 API URL
+const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:8000/v1/completions'
+
+onMounted(async () => {
+    if (!root.value) return
+
+    crepe = new Crepe({
+        root: root.value,
+        defaultValue: '# Welcome to LLM in text\n\nStart writing your content here...',
+    })
+
+    await crepe.create()
+
+    // 注册 Inline Suggestion Plugin
+    const plugin = createInlineSuggestionPlugin({
+        apiUrl: API_URL,
+        onSuggestion: (text) => {
+            suggestion.value = text
+            updateCursorPosition()
+        },
+        onError: (error) => {
+            console.error('Suggestion error:', error)
+            suggestion.value = ''
+        }
+    })
+
+    crepe.ctx.get().updateState((state) => {
+        return state.reconfigure({
+            plugins: [...state.plugins, plugin]
+        })
+    })
+})
+
+// 修复：组件卸载时清理资源
+onUnmounted(() => {
+    if (crepe) {
+        crepe.destroy()
+    }
+})
+
+const updateCursorPosition = async () => {
+    if (!crepe) return
+
+    try {
+        const ctx = crepe.ctx.get()
+        const view = ctx.get('view')
+        const { from } = view.state.selection
+
+        const coords = view.coordsAtPos(from)
+        const containerRect = containerRef.value?.getBoundingClientRect()
+        if (!containerRect) return
+
+        cursorRect.value = {
+            left: coords.left - containerRect.left,
+            top: coords.top - containerRect.top + window.scrollY,
+            fontSize: 16,
+            fontFamily: 'monospace',
+        }
+    } catch (e) {
+        console.error('updateCursorPosition error:', e)
+    }
+}
+
+const acceptSuggestion = () => {
+    if (suggestion.value) {
+        const ctx = crepe.ctx.get()
+        const view = ctx.get('view')
+        view.dispatch(view.state.tr.insertText(suggestion.value))
+        suggestion.value = ''
+    }
+}
+
+const dismissSuggestion = () => {
+    suggestion.value = ''
+}
+</script>
+
+<template>
+  <div class="editor-container" ref="containerRef">
+    <div ref="root" class="milkdown-editor"></div>
+
+    <!-- 修复：正确的组件标签语法 -->
+    <GhostTextOverlay
+      v-if="suggestion && cursorRect"
+      :suggestion="suggestion"
+      :position="cursorRect"
+      @accept="acceptSuggestion"
+      @dismiss="dismissSuggestion"
+    />
+  </div>
+</template>
+```
 
 ### 4. 后端：FastAPI 服务
 **文件**: `backend/main.py`
-- POST `/v1/completions` 流式接口
-- 请求体验证和解析
+
+#### 核心实现要点
+
+```python
+from fastapi import FastAPI, HTTPException
+from fastapi.responses import StreamingResponse
+from fastapi.middleware.cors import CORSMiddleware  # 修复：添加 CORS 支持
+from pydantic import BaseModel
+import os
+import json
+
+app = FastAPI()
+
+# 修复：添加 CORS 中间件
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],  # 生产环境应该限制具体域名
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+class CompletionRequest(BaseModel):
+    prefix: str
+    suffix: str
+    languageId: str = 'markdown'
+
+def generate_stream(request: CompletionRequest):
+    from prompt import build_prompt
+    from llm import stream_openai
+
+    try:
+        prompt = build_prompt(request.prefix, request.suffix)
+
+        async def gen():
+            chunk_count = 0
+            async for chunk in stream_openai(prompt):
+                chunk_count += 1
+                yield f"data: {chunk}\n\n"
+            yield "data: {\"done\": true}\n\n"
+        return gen()
+    except Exception as e:
+        # 修复：遵循"获取失败直接报错"原则
+        error_msg = f"{{\"error\": \"{str(e)}\"}}"
+        yield f"data: {error_msg}\n\n"
+        raise  # 重新抛出异常
+
+@app.post("/v1/completions")
+async def create_completion(request: CompletionRequest):
+    return StreamingResponse(generate_stream(request), media_type="text/event-stream")
+
+if __name__ == "__main__":
+    import uvicorn
+    uvicorn.run(app, host="0.0.0.0", port=8000)
+```
 
 ### 5. 后端：Prompt 构建和 LLM 调用
 **文件**: `backend/prompt.py`, `backend/llm.py`
-- 构建补全 Prompt（参考 completions-sample-code 的 extractPrompt）
-- OpenAI API 流式调用
-- 返回 SSE 格式响应
+
+#### Prompt 构建
+
+```python
+import os
+from typing import Tuple
+
+def build_prompt(prefix: str, suffix: str) -> str:
+    """
+    构建用于代码补全的 Prompt。
+    参考 completions-sample-code 的 extractPrompt 逻辑简化实现。
+    """
+    MAX_CONTEXT_LINES = 30
+
+    prefix_lines = prefix.split('\n')
+    suffix_lines = suffix.split('\n') if suffix else []
+
+    recent_prefix = '\n'.join(prefix_lines[-MAX_CONTEXT_LINES:])
+    recent_suffix = '\n'.join(suffix_lines[:5])
+
+    prompt = f"""
+You are a helpful writing assistant. Continue the text naturally based on the context.
+
+Context (before cursor):
+{recent_prefix}
+
+Complete this:
+{suffix if suffix else '(cursor here)'}
+
+Continue:"""
+
+    return prompt.strip()
+```
+
+#### LLM 调用
+
+```python
+import os
+from typing import AsyncGenerator
+from openai import AsyncOpenAI
+import json
+
+api_key = os.getenv('OPENAI_API_KEY', 'ollama')
+base_url = os.getenv('OLLAMA_BASE_URL', 'http://localhost:11434/v1/')
+model = os.getenv('OLLAMA_MODEL', 'gpt-4')
+
+client = AsyncOpenAI(api_key=api_key, base_url=base_url)
+
+async def stream_openai(prompt: str) -> AsyncGenerator[str, None]:
+    """
+    调用 OpenAI/Ollama API 并流式返回补全内容。
+    参考 completions-sample-code 的 streaming 逻辑。
+    """
+    try:
+        stream = await client.chat.completions.create(
+            model=model,
+            messages=[{"role": "user", "content": prompt}],
+            stream=True,
+            max_tokens=128,
+            temperature=0.2,
+        )
+
+        chunk_count = 0
+        async for chunk in stream:
+            if chunk.choices[0].delta.content:
+                content = chunk.choices[0].delta.content
+                chunk_count += 1
+                yield json.dumps({"content": content})
+
+    except Exception as e:
+        # 修复：遵循"获取失败直接报错"原则
+        yield json.dumps({"error": str(e)})
+        raise  # 重新抛出异常
+```
 
 ## 文件结构
 
@@ -66,13 +519,14 @@ llm-in-text/
 │   ├── components/
 │   │   └── MilkdownEditor.vue      [修改]
 │   ├── plugins/
-│   │   └── inlineSuggestionPlugin.ts [新建]
+│   │   ├── inlineSuggestionPlugin.ts [修改]
+│   │   └── types.ts                [新建]
 │   └── ...
 └── backend/
-    ├── main.py                      [新建]
-    ├── prompt.py                    [新建]
-    ├── llm.py                       [新建]
-    └── requirements.txt             [新建]
+    ├── main.py                      [修改]
+    ├── prompt.py                    [修改]
+    ├── llm.py                       [修改]
+    └── requirements.txt             [修改]
 ```
 
 ## API 设计
@@ -95,9 +549,51 @@ data: {"content": "a te"}
 
 data: {"content": "a test"}
 
-data: [DONE]
+data: {"done": true}
 ```
 
+## 已知问题及修复方案
+
+### 🔴 严重问题（P0）
+
+#### 1. 全局状态污染
+**位置**: `inlineSuggestionPlugin.ts:6-8`
+**问题**: 使用模块级全局变量，多个编辑器实例会共享状态
+**修复**: 使用 ProseMirror 插件的状态管理机制，每个插件实例维护自己的状态
+
+#### 2. 错误处理违反原则
+**位置**: `llm.py:42-44`, `main.py:34-37`
+**问题**: 错误时只返回错误信息，不抛出异常
+**修复**: 遵循"获取失败直接报错"原则，在 yield 错误信息后重新抛出异常
+
+### 🟡 中等问题（P1）
+
+#### 3. 代码重复
+**问题**: `fetchSuggestion` 逻辑在两个文件中重复
+**修复**: 提取共享的 `fetchSuggestion` 函数，在插件和编辑器组件中复用
+
+#### 4. 缺少 CORS 配置
+**问题**: 后端没有配置 CORS，可能导致跨域请求失败
+**修复**: 在 FastAPI 中添加 CORS 中间件
+
+#### 5. 建议文本无长度限制
+**问题**: 建议文本可能过长，影响显示效果
+**修复**: 在 GhostTextOverlay 组件中添加 `maxLength` prop，截断过长的建议
+
+### 🟢 轻微问题（P2）
+
+#### 6. 缺少加载状态
+**问题**: 用户无法知道是否正在获取建议
+**修复**: 在插件状态中添加 `loading` 字段，在 UI 中显示加载指示器
+
+#### 7. 缺少类型定义
+**问题**: TypeScript 代码中缺少完整的类型定义
+**修复**: 添加 `SuggestionState` 接口和完整的类型定义
+
+#### 8. API URL 硬编码
+**问题**: API URL 硬编码在前端代码中
+**修复**: 使用环境变量 `VITE_API_URL` 配置 API URL
+
 ## 参考代码映射
 
 | completions-sample-code | 本项目实现 |
@@ -107,5 +603,23 @@ data: [DONE]
 | `networking.ts postRequest()` | 后端 API 接口 |
 | `prompt/extractPrompt()` | 后端 Prompt 构建 |
 
+## 最佳实践
+
+### 错误处理
+- 遵循"获取失败直接报错"原则
+- 不返回默认值，不尝试隐藏报错信息
+- 在前端和后端都实现完整的错误处理
+
+### 性能优化
+- 使用 150ms 防抖，避免频繁请求
+- 流式传输（SSE），降低延迟
+- 及时清理定时器和事件监听器
+
+### 代码质量
+- 避免全局变量，使用插件状态管理
+- 提取共享逻辑，避免代码重复
+- 添加完整的类型定义
+- 移除调试日志或条件化输出
+
 ## 下一步
 确认计划后切换到 Code 模式开始实现。

plans/milkdown-editor-plan.md

@@ -16,7 +16,7 @@
 graph TB
     A[App.vue] --> B[MilkdownProvider]
     B --> C[Milkdown Editor - Crepe]
-    
+
     subgraph "Crepe 核心功能"
         D[WYSWIYG 编辑体验]
         E[Markdown 语法即时渲染]
@@ -24,6 +24,14 @@ graph TB
         G[代码块高亮]
         H[图片粘贴支持]
     end
+
+    subgraph "集成功能"
+        I[GhostTextOverlay<br/>建议文本显示]
+        J[InlineSuggestionPlugin<br/>智能补全]
+    end
+
+    C --> I
+    C --> J
 ```
 
 ## 实施步骤
@@ -38,19 +46,280 @@ npm install @milkdown/crepe @milkdown/vue
 
 **文件**: `src/components/MilkdownEditor.vue`
 
+#### 核心实现要点
+
 ```vue
 <template>
-  <MilkdownProvider>
-    <Milkdown />
-  </MilkdownProvider>
+  <div class="editor-container" ref="containerRef">
+    <button class="export-btn" @click="exportMarkdown">导出文件</button>
+
+    <div ref="root" class="milkdown-editor"></div>
+
+    <!-- 修复：正确的组件标签语法 -->
+    <GhostTextOverlay
+      v-if="suggestion && cursorRect"
+      :suggestion="suggestion"
+      :position="cursorRect"
+      @accept="acceptSuggestion"
+      @dismiss="dismissSuggestion"
+    />
+  </div>
 </template>
 
 <script setup>
-import { Milkdown, MilkdownProvider, useEditor } from '@milkdown/vue'
+import { onMounted, onUnmounted, ref } from 'vue'
 import { Crepe } from '@milkdown/crepe'
+import GhostTextOverlay from './GhostTextOverlay.vue'
 
-const { get } = useEditor((root) => new Crepe({ root }))
+const root = ref(null)
+const containerRef = ref(null)
+let crepe = null
+
+const suggestion = ref('')
+const cursorRect = ref(null)
+let debounceTimer = null
+let lastPos = -1
+
+const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:8000/v1/completions'
+const DEBOUNCE_MS = 150
+
+onMounted(async () => {
+    if (!root.value) return
+
+    crepe = new Crepe({
+        root: root.value,
+        defaultValue: '# Welcome to LLM in text\n\nStart writing your content here...',
+    })
+
+    await crepe.create()
+
+    // 修复：使用更可靠的事件绑定方式
+    initEditorEvents()
+})
+
+// 修复：组件卸载时清理资源
+onUnmounted(() => {
+    if (debounceTimer) {
+        clearTimeout(debounceTimer)
+    }
+    if (crepe) {
+        crepe.destroy()
+    }
+})
+
+const getCursorPosition = async () => {
+    if (!crepe) return null
+
+    try {
+        const ctx = crepe.ctx.get()
+        const view = ctx.get('view')
+        const { from } = view.state.selection
+
+        const coords = view.coordsAtPos(from)
+        const containerRect = containerRef.value?.getBoundingClientRect()
+        if (!containerRect) return null
+
+        return {
+            left: coords.left - containerRect.left,
+            top: coords.top - containerRect.top + window.scrollY,
+            fontSize: 16,
+            fontFamily: 'monospace',
+        }
+    } catch (e) {
+        console.error('getCursorPosition error:', e)
+        return null
+    }
+}
+
+const fetchSuggestion = async (prefix, suffix) => {
+    try {
+        const res = await fetch(API_URL, {
+            method: 'POST',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ prefix, suffix, languageId: 'markdown' }),
+        })
+
+        // 修复：遵循"获取失败直接报错"原则
+        if (!res.ok) {
+            const errorText = await res.text()
+            throw new Error(`API request failed: ${res.status} - ${errorText}`)
+        }
+
+        const reader = res.body?.getReader()
+        if (!reader) {
+            throw new Error('No response body reader available')
+        }
+
+        let text = ''
+        while (true) {
+            const { done, value } = await reader.read()
+            if (done) break
+            const chunk = new TextDecoder().decode(value)
+
+            const lines = chunk.split('\n').filter(l => l.startsWith('data: '))
+            for (const line of lines) {
+                try {
+                    const data = JSON.parse(line.slice(6))
+                    if (data.content) {
+                        text += data.content
+                    }
+                    if (data.done || data.error) break
+                } catch (e) {
+                    // 忽略 JSON 解析错误，继续处理下一行
+                }
+            }
+        }
+
+        return text
+    } catch (e) {
+        // 修复：直接抛出错误，不返回空字符串
+        throw e
+    }
+}
+
+const onInput = async () => {
+    if (!crepe) return
+
+    try {
+        const ctx = crepe.ctx.get()
+        const view = ctx.get('view')
+        const { from } = view.state.selection
+
+        if (from === lastPos) return
+        lastPos = from
+
+        const prefix = view.state.doc.textBetween(0, from)
+        const suffix = view.state.doc.textBetween(from, view.state.doc.content.size)
+
+        // 修复：使用正确的字符串截取方法
+        console.log('Prefix preview:', prefix.slice(-50))
+
+        clearTimeout(debounceTimer)
+        debounceTimer = setTimeout(async () => {
+            try {
+                cursorRect.value = await getCursorPosition()
+                suggestion.value = await fetchSuggestion(prefix, suffix)
+            } catch (e) {
+                console.error('Failed to fetch suggestion:', e)
+                suggestion.value = ''
+            }
+        }, DEBOUNCE_MS)
+    } catch (e) {
+        console.error('onInput error:', e)
+    }
+}
+
+const handleTab = () => {
+    if (suggestion.value) {
+        const ctx = crepe.ctx.get()
+        const view = ctx.get('view')
+        view.dispatch(view.state.tr.insertText(suggestion.value))
+        suggestion.value = ''
+    }
+}
+
+const dismissSuggestion = () => {
+    suggestion.value = ''
+}
+
+const acceptSuggestion = () => {
+    if (suggestion.value) {
+        const ctx = crepe.ctx.get()
+        const view = ctx.get('view')
+        view.dispatch(view.state.tr.insertText(suggestion.value))
+        suggestion.value = ''
+    }
+}
+
+const exportMarkdown = async () => {
+    if (!crepe) return
+    const markdown = await crepe.getMarkdown()
+    const blob = new Blob([markdown], { type: 'text/markdown' })
+    const url = URL.createObjectURL(blob)
+    const a = document.createElement('a')
+    a.href = url
+    a.download = `document-${Date.now()}.md`
+    a.click()
+    URL.revokeObjectURL(url)
+}
+
+// 修复：使用更可靠的事件绑定方式
+const initEditorEvents = () => {
+    if (!crepe) return
+
+    try {
+        const ctx = crepe.ctx.get()
+        const view = ctx.get('view')
+
+        // 直接在编辑器 DOM 上监听输入事件
+        view.dom.addEventListener('input', onInput)
+        view.dom.addEventListener('keydown', (e) => {
+            if (e.key === 'Tab') {
+                handleTab()
+            }
+        })
+    } catch (e) {
+        console.error('Failed to bind events:', e)
+    }
+}
 </script>
+
+<style scoped>
+.editor-container {
+    position: relative;
+}
+
+.export-btn {
+    position: fixed;
+    top: 20px;
+    right: 20px;
+    padding: 8px 16px;
+    background-color: #4a90d9;
+    color: white;
+    border: none;
+    border-radius: 4px;
+    cursor: pointer;
+    z-index: 1000;
+}
+
+.export-btn:hover {
+    background-color: #3a7bc8;
+}
+
+.milkdown-editor {
+    width: 100vw;
+    height: 100vh;
+    background-color: #ffffff;
+    overflow-y: auto;
+}
+
+.milkdown-editor::-webkit-scrollbar {
+    width: 8px;
+}
+
+.milkdown-editor::-webkit-scrollbar-track {
+    background: transparent;
+}
+
+.milkdown-editor::-webkit-scrollbar-thumb {
+    background-color: #ddd;
+    border-radius: 4px;
+}
+
+.milkdown-editor :deep(.milkdown) {
+    max-width: 900px;
+    margin: 0 auto !important;
+    padding: 20px 40px !important;
+    min-height: calc(100vh - 40px);
+}
+
+.milkdown-editor :deep(*) {
+    margin-top: 0 !important;
+    margin-bottom: 0 !important;
+    padding-top: 0 !important;
+    padding-bottom: 0 !important;
+}
+</style>
 ```
 
 ### Step 3: 更新 App.vue
@@ -67,8 +336,88 @@ import '@milkdown/crepe/theme/common/style.css'
 import '@milkdown/crepe/theme/frame.css'
 ```
 
+## 已知问题及修复方案
+
+### 🔴 严重问题（P0）
+
+#### 1. 模板语法错误
+**位置**: `MilkdownEditor.vue:7-13`
+**问题**: GhostTextOverlay 组件标签缺少尖括号
+**修复**: 使用正确的 Vue 组件标签语法 `<GhostTextOverlay>` 和 `</GhostTextOverlay>`
+
+#### 2. 字符串截取错误
+**位置**: `MilkdownEditor.vue:155`
+**问题**: `prefix.substring(-50)` 在 JavaScript 中会返回整个字符串
+**修复**: 改为 `prefix.slice(-50)` 或 `prefix.substring(prefix.length - 50)`
+
+#### 3. 错误处理违反原则
+**位置**: `MilkdownEditor.vue:92-94`
+**问题**: 请求失败时返回空字符串而不是抛出错误
+**修复**: 遵循"获取失败直接报错"原则，抛出异常而不是返回默认值
+
+### 🟡 中等问题（P1）
+
+#### 4. 内存泄漏风险
+**问题**: 组件卸载时没有清理 `debounceTimer`
+**修复**: 添加 `onUnmounted` 生命周期钩子，清理定时器和编辑器实例
+
+#### 5. 不可靠的事件绑定
+**问题**: 使用硬编码的 500ms 延迟等待编辑器创建
+**修复**: 在 `await crepe.create()` 后直接调用 `initEditorEvents()`
+
+#### 6. 代码重复
+**问题**: `fetchSuggestion` 逻辑在两个文件中重复
+**修复**: 将共享逻辑提取到独立的工具函数或服务中
+
+#### 7. 全局状态污染
+**问题**: 插件使用模块级全局变量
+**修复**: 使用 ProseMirror 插件的状态管理机制
+
+### 🟢 轻微问题（P2）
+
+#### 8. 大量调试日志
+**问题**: 代码中包含大量 `console.log` 调试语句
+**修复**: 移除或条件化调试日志
+
+#### 9. 缺少类型定义
+**问题**: TypeScript 代码中缺少完整的类型定义
+**修复**: 添加完整的 TypeScript 类型定义
+
+#### 10. 没有加载状态
+**问题**: 用户无法知道是否正在获取建议
+**修复**: 添加加载状态指示器
+
+#### 11. 建议文本无长度限制
+**问题**: 建议文本可能过长
+**修复**: 添加建议文本长度限制
+
+#### 12. API URL 硬编码
+**问题**: API URL 硬编码在前端代码中
+**修复**: 使用环境变量配置 API URL
+
+#### 13. 缺少 CORS 配置
+**问题**: 后端没有配置 CORS
+**修复**: 在 FastAPI 中添加 CORS 中间件
+
 ## 全屏覆盖样式要点
 
 - 编辑器容器: `width: 100vw; height: 100vh`
 - 移除默认 padding/margin
-- 纯编辑器模式，无预览面板
+- 纯编辑器模式，无预览面板
+- 自定义滚动条样式
+
+## 性能优化建议
+
+1. **防抖优化**: 保持 150ms 防抖，避免频繁请求
+2. **流式响应**: 使用 SSE 流式传输，降低延迟
+3. **上下文截取**: 智能截取上下文（光标前30行 + 后5行）
+4. **内存管理**: 及时清理定时器和事件监听器
+5. **代码精简**: 移除冗余代码和注释
+
+## 测试要点
+
+1. 编辑器基本功能测试
+2. 建议功能测试（Tab 接受、Esc 取消、点击接受）
+3. 错误处理测试（网络错误、API 错误）
+4. 性能测试（大量文本输入）
+5. 内存泄漏测试（长时间使用）