feat: Phase 3 - API layer + Pinia stores + app integration

- HTTP client (axios interceptors, token mgmt, typed APIs)
- Pinia stores: token, user (login/logout), app (dark mode, sidebar)
- globalConfig TS types + Window augmentation
- Vue Router (hash history, auth guard)
- Login/Home/Mine pages (Vant UI)
- Vant integration + globalConfig dev script
- Build passes (vue-tsc + vite)

src/api/index.ts

@@ -0,0 +1,43 @@
+/**
+ * API 模块聚合入口
+ *
+ * 统一导出所有 API 子模块的方法和类型，业务代码只需
+ * `import { login, getUserInfo } from '@/api'` 即可使用。
+ *
+ * @module api
+ */
+
+// ── 用户模块 ──
+export {
+  login,
+  getUserInfo,
+  logout,
+  resetPassword,
+} from './user'
+export type {
+  LoginParams,
+  LoginResult,
+  ResetPasswordParams,
+  UserInfo,
+} from './user'
+
+// ── 通用模块 ──
+export {
+  uploadFile,
+  uploadFiles,
+  getDictData,
+  getDictDataByType,
+  getCaptcha,
+  getConfigValue,
+  getConfigItem,
+} from './common'
+export type {
+  UploadResult,
+  DictItem,
+  CaptchaResult,
+  ConfigItem,
+} from './common'
+
+// ── HTTP 工具（便捷导出） ──
+export { getToken, setToken, removeToken } from '@/utils/http'
+export type { ApiResponse } from '@/utils/http'