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/src/manifest.json

@@ -0,0 +1,22 @@
+{
+  "name": "普拉提约课",
+  "appid": "",
+  "description": "普拉提工作室约课小程序",
+  "versionName": "0.1.0",
+  "versionCode": "100",
+  "transformPx": false,
+  "mp-weixin": {
+    "appid": "",
+    "setting": {
+      "urlCheck": false,
+      "es6": true,
+      "minified": true
+    },
+    "usingComponents": true,
+    "permission": {
+      "scope.userLocation": {
+        "desc": "用于获取工作室位置导航"
+      }
+    }
+  }
+}