重构：文件系统模块化架构，增强 Markdown 渲染

- 拆分 FileSystem.vue 为模块化组件架构
- 新增 Markdown Mermaid 图表渲染支持
- 新增 180+ 编程语言代码高亮
- 修复编辑/预览模式切换渲染问题
- 优化亮色/暗色模式主题适配
- 新增 TypeScript 类型定义

web/tsconfig.json

@@ -0,0 +1,32 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "module": "ESNext",
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "jsx": "preserve",
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "allowJs": true,
+    "strict": false,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "allowSyntheticDefaultImports": true,
+    "forceConsistentCasingInFileNames": true,
+    "useDefineForClassFields": true,
+    "sourceMap": true,
+    "baseUrl": ".",
+    "paths": {
+      "@/*": ["src/*"]
+    }
+  },
+  "include": [
+    "src/**/*.ts",
+    "src/**/*.tsx",
+    "src/**/*.vue",
+    "src/**/*.d.ts"
+  ],
+  "exclude": [
+    "node_modules",
+    "dist"
+  ]
+}