refactor: 将项目迁移到 Nuxt 4

该项目从 Vue 3 迁移到了 Nuxt 4，对代码结构和配置进行了相应调整。
- 修改了环境变量前缀，将 `VITE_` 替换为 `NUXT_PUBLIC_`，以便与 Nuxt 的环境变量配置兼容。
- 添加了新的环境变量 `WAKATIME_API_KEY` 和可选变量 `WAKATIME_API_URL` 用于配置 Wakatime API。

tsconfig.json

@@ -1,25 +1,7 @@
 {
+    "extends": "./.nuxt/tsconfig.json",
     "compilerOptions": {
-        "target": "ES2020",
-        "useDefineForClassFields": true,
-        "module": "ESNext",
-        "lib": ["ES2020", "DOM", "DOM.Iterable"],
-        "skipLibCheck": true,
-
-        /* Bundler mode */
-        "moduleResolution": "bundler",
-        "allowImportingTsExtensions": true,
-        "resolveJsonModule": true,
-        "isolatedModules": true,
-        "noEmit": true,
-        "jsx": "preserve",
-
-        /* Linting */
-        "strict": true,
-        "noUnusedLocals": true,
-        "noUnusedParameters": true,
-        "noFallthroughCasesInSwitch": true
+        "types": ["node"]
     },
-    "include": ["src/**/*.ts", "src/**/*.d.ts", "src/**/*.tsx", "src/**/*.vue"],
-    "references": [{ "path": "./tsconfig.node.json" }]
+    "include": ["nuxt.config.ts", "src/**/*.ts", "src/**/*.vue", "src/**/*.d.ts", "server/**/*.ts"]
 }