feat(deploy): 正式環境部署設定

- frontend/api.js: API URL 自動判斷 (localhost=dev, 其他=相對路徑 /api/v1)
- main.py: 加入 StaticFiles 掛載 admin-portal，CORS 開放
- schedule_tenant: Traefik 路由範本更新
  - 管理租戶加入 /api 路由 (priority 200)
  - /admin 加入 StripPrefix middleware
  - admin 服務改指向 vmis-backend:10281
- docker/vmis: 新增 Dockerfile + docker-compose.yml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/main.py

@@ -1,6 +1,8 @@
+import os
 from contextlib import asynccontextmanager
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
 
 from app.core.database import SessionLocal
 from app.services.seed import seed_initial_data
@@ -31,7 +33,7 @@ app = FastAPI(
 
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=["http://localhost:10280", "http://localhost:10290"],
+    allow_origins=["*"],
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],
@@ -43,3 +45,9 @@ app.include_router(api_router, prefix="/api/v1")
 @app.get("/health")
 def health():
     return {"status": "ok", "service": "vmis-backend"}
+
+
+# 靜態前端（admin portal）— 掛載在最後，讓 API 路由優先
+_frontend_dir = os.path.join(os.path.dirname(__file__), "..", "frontend")
+if os.path.isdir(_frontend_dir):
+    app.mount("/", StaticFiles(directory=_frontend_dir, html=True), name="frontend")