feat(tts): add api endpoints and optimization for apple silicon

Introduce a comprehensive TTS/ASR module that:
- Adds /v1/tts-asr/config, /status, /warmup, /tts, /asr endpoints with detailed JSON responses
- Implements Apple‑Silicon detection, device selection (MPS/CUDA/CPU), and memory limiting logic
- Supports selectable model size, quantization, and offline mode via environment variables
- Adds robust audio validation and multi‑path resampling fallback
- Provides new README sections for API usage, device detection, and performance benchmarking
- Includes a full testing suite: unit tests, integration tests, macOS simulation and performance reports
- Updates backend dependencies and CI scripts
- Adds new front‑end views and components for Univer editor integration

All changes are backward compatible; new features are exposed through environment variables and new API routes.

src/composables/useFileSystem.js

@@ -81,6 +81,31 @@ export function useFileSystem() {
       const stored = localStorage.getItem(STORAGE_KEY)
       if (stored) {
         tree.value = JSON.parse(stored)
+      } else {
+        // 创建示例文件和文件夹
+        const welcomeId = generateId()
+        const folderId = generateId()
+        tree.value = [
+          {
+            id: folderId,
+            name: '示例文件夹',
+            type: 'folder',
+            children: [],
+            parentId: null,
+            createdAt: Date.now(),
+            updatedAt: Date.now()
+          },
+          {
+            id: welcomeId,
+            name: '欢迎使用.md',
+            type: 'file',
+            content: '# 欢迎使用文件系统\n\n这是一个类似 GitHub 风格的文件浏览器。\n\n## 功能\n\n- ✅ 文件夹展开/折叠\n- ✅ 文件选中高亮\n- ✅ 拖拽移动\n- ✅ 右键菜单\n- ✅ 重命名\n- ✅ 新建/删除\n\n点击左侧的文件或文件夹来查看内容。\n',
+            parentId: null,
+            createdAt: Date.now(),
+            updatedAt: Date.now()
+          }
+        ]
+        save()
       }
     } catch {
       tree.value = []
@@ -174,13 +199,9 @@ export function useFileSystem() {
     error.value = null
   }
 
-  function select(id) {
-    selectedId.value = id
-    const node = findNode(tree.value, id)
-    if (node && node.type === 'folder') {
-      toggleFolder(id)
-    }
-  }
+function select(id) {
+  selectedId.value = id
+}
 
   function toggleFolder(id) {
     const node = findNode(tree.value, id)