feat: add admin UI frontend and complete backend APIs

- Add Vue 3 frontend with Element Plus
- Implement login, dashboard, tenant management
- Add app configuration, logs viewer, stats pages
- Add user management for admins
- Update Drone CI to build and deploy frontend
- Frontend ports: 3001 (test), 4001 (prod)

backend/app/main.py

@@ -4,6 +4,9 @@ from fastapi.middleware.cors import CORSMiddleware
 
 from .config import get_settings
 from .routers import stats_router, logs_router, config_router, health_router
+from .routers.auth import router as auth_router
+from .routers.tenants import router as tenants_router
+from .routers.tenant_apps import router as tenant_apps_router
 
 settings = get_settings()
 
@@ -24,9 +27,12 @@ app.add_middleware(
 
 # 注册路由
 app.include_router(health_router)
-app.include_router(stats_router)
-app.include_router(logs_router)
-app.include_router(config_router)
+app.include_router(auth_router, prefix="/api")
+app.include_router(tenants_router, prefix="/api")
+app.include_router(tenant_apps_router, prefix="/api")
+app.include_router(stats_router, prefix="/api")
+app.include_router(logs_router, prefix="/api")
+app.include_router(config_router, prefix="/api")
 
 
 @app.get("/")