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)

package.json

@@ -21,7 +21,8 @@
     "supercluster": "^8.0.1",
     "uuid": "^14.0.0",
     "vant": "^4.9.24",
-    "vue": "^3.5.34"
+    "vue": "^3.5.34",
+    "vue-router": "^4.6.4"
   },
   "devDependencies": {
     "@types/node": "^24.12.3",