refactor(editor): migrate to ProseMirror Mark-based ghost text system

- Replace overlay-based GhostTextOverlay.vue with ProseMirror Mark system
- Add AI toggle button with enable/disable functionality
- Implement new copilotPlugin.ts using copilotGhostMark for inline suggestions
- Fix cursor position offset in prompt.py by moving first suffix char to prefix
- Improve API error handling with abort signal support and debug logging
- Update model configuration from gpt-oss:120b to gpt-oss:20b
- Add button tooltips and improve editor styling
- Remove deprecated inlineSuggestionPlugin.ts
- Update README with new architecture diagram and feature documentation

backend/main.py

@@ -71,7 +71,7 @@ async def create_completion(request: CompletionRequest):
     print(f"[Backend] POST /v1/completions called")
     print(f"[Backend] Received request - prefix length: {len(request.prefix)}, suffix length: {len(request.suffix)}")
     
-    OLLAMA_MODEL = os.getenv('OLLAMA_MODEL', 'gpt-oss:120b')
+    OLLAMA_MODEL = os.getenv('OLLAMA_MODEL', 'gpt-oss:20b')
     OLLAMA_HOST = os.getenv('OLLAMA_HOST', 'http://192.168.0.120:11434')
     
     print(f"[LLM] Using host: {OLLAMA_HOST}, model: {OLLAMA_MODEL}")
@@ -123,8 +123,9 @@ async def create_completion(request: CompletionRequest):
         # 返回完整内容
         async def generate():
             if content:
+                print(f"[LLM] Yielding full content: {repr(content)}")
                 yield f"data: {json.dumps({'content': content})}\n\n"
-            yield f"data: {json.dumps({'done': true})}\n\n"
+            yield f"data: {json.dumps({'done': True})}\n\n"
         
         return StreamingResponse(generate(), media_type="text/event-stream")