feat(app): initialize uni-app with routing, stores, and infrastructure

- Vue 3 + TypeScript + Pinia + SCSS
- 3-tab navigation (home, booking, profile) + 11 sub-pages
- HTTP client with JWT auth, request interceptors
- Pinia stores: user (auth, profile, memberships), studio, booking
- Utility functions: price formatting, date helpers
- WeChat login helper
- All pages as stubs ready for implementation

packages/app/tsconfig.json

@@ -0,0 +1,19 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "jsx": "preserve",
+    "jsxImportSource": "vue",
+    "sourceMap": true,
+    "declaration": false,
+    "declarationMap": false,
+    "types": [
+      "@dcloudio/types",
+      "@types/node"
+    ]
+  },
+  "include": ["src/**/*.ts", "src/**/*.vue", "src/**/*.d.ts"],
+  "exclude": ["node_modules", "dist", "unpackage"]
+}