feat: FastAPI 挂载前端静态文件

- GET /        -> frontend/index.html  客户充值页
- GET /admin   -> frontend/admin.html  管理后台
- /static/*    -> frontend/ 目录静态资源
- requirements.txt 补充 aiofiles 依赖

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

backend/app.py

@@ -21,10 +21,13 @@ import json
 import logging
 import time
 from contextlib import asynccontextmanager
+from pathlib import Path
 from typing import Optional
 
 from fastapi import FastAPI, HTTPException, Header, Depends
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.responses import FileResponse
+from fastapi.staticfiles import StaticFiles
 from pydantic import BaseModel
 
 import config as cfg_mod
@@ -33,6 +36,8 @@ import upstream as up
 import poller
 from crypto import encode_our_cdk, decode_our_cdk, key_from_hex
 
+FRONTEND_DIR = Path(__file__).parent.parent / "frontend"
+
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger("app")
 
@@ -59,6 +64,18 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
+# 前端静态文件（index.html / admin.html 等）
+if FRONTEND_DIR.exists():
+    app.mount("/static", StaticFiles(directory=str(FRONTEND_DIR)), name="static")
+
+@app.get("/")
+def serve_index():
+    return FileResponse(str(FRONTEND_DIR / "index.html"))
+
+@app.get("/admin")
+def serve_admin():
+    return FileResponse(str(FRONTEND_DIR / "admin.html"))
+
 
 # ─── 鉴权依赖 ─────────────────────────────────────────────────────────────────
 

backend/requirements.txt

@@ -3,3 +3,4 @@ uvicorn[standard]>=0.29.0
 pydantic>=2.0.0
 requests>=2.31.0
 pycryptodome>=3.20.0
+aiofiles>=23.0.0