feat: v0.10.0 生产环境优化 — HTTPS、前端生产构建、安全加固

- feat(deploy): 前端多阶段构建 (vite build + nginx:alpine)，移除 Vite 开发模式
- feat(deploy): OpenResty HTTPS 配置 (SSL + HSTS + 安全头)
- fix(ws): WebSocket 路由添加 /api 前缀，修正前后端路径不匹配
- security: SSH AutoAddPolicy → WarningPolicy
- security: CORS 来源环境变量化 (CORS_ORIGINS)
- security: 限流器使用 X-Forwarded-For 真实客户端 IP
- perf(db): 数据库连接池配置 (pool_size=20, max_overflow=40)
- refactor: 移除硬编码 URL/IP (NTP、域名、微信代理)，改为环境变量
- chore: 更新 .env.example 模板，补充新增配置项
- chore: 清理 .reasonix/、scripts/、guide.md 无用文件
- docs: 更新 CLAUDE.md 至 v0.10.0，补充生产架构文档

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

backend/app/main.py

@@ -1,10 +1,10 @@
 """FastAPI 主应用"""
+import os
 import logging
 from pythonjsonlogger import jsonlogger
 from fastapi import FastAPI, Request
 from fastapi.middleware.cors import CORSMiddleware
 from slowapi import Limiter, _rate_limit_exceeded_handler
-from slowapi.util import get_remote_address
 from slowapi.errors import RateLimitExceeded
 from starlette.middleware.base import BaseHTTPMiddleware
 from starlette.responses import JSONResponse
@@ -29,15 +29,20 @@ class RequestSizeLimitMiddleware(BaseHTTPMiddleware):
                 return JSONResponse({"detail": "请求体过大，最大 10MB"}, status_code=413)
         return await call_next(request)
 
-# CORS 白名单
-ALLOWED_ORIGINS = [
-    "http://localhost:5173",
-    "http://localhost:18002",
-    "https://onu.dhdx.fun",
-]
-allowed = [o for o in ALLOWED_ORIGINS if o]
+# CORS 白名单 — 支持通过环境变量 CORS_ORIGINS 覆盖（逗号分隔）
+CORS_ORIGINS_DEFAULT = "http://localhost:5173,http://localhost:18002,https://onu.dhdx.fun"
+ALLOWED_ORIGINS = [o.strip() for o in os.getenv("CORS_ORIGINS", CORS_ORIGINS_DEFAULT).split(",") if o.strip()]
 
-limiter = Limiter(key_func=get_remote_address, default_limits=["120/minute"])
+
+def get_client_ip(request: Request) -> str:
+    """读取 X-Forwarded-For 首字段作为真实客户端 IP"""
+    forwarded = request.headers.get("X-Forwarded-For")
+    if forwarded:
+        return forwarded.split(",")[0].strip()
+    return request.client.host if request.client else "unknown"
+
+
+limiter = Limiter(key_func=get_client_ip, default_limits=["120/minute"])
 
 app = FastAPI(title=settings.APP_NAME, debug=settings.DEBUG)
 app.state.limiter = limiter
@@ -46,7 +51,7 @@ app.add_exception_handler(RateLimitExceeded, _rate_limit_exceeded_handler)
 app.add_middleware(RequestSizeLimitMiddleware)
 app.add_middleware(
     CORSMiddleware,
-    allow_origins=allowed if allowed else ["*"],
+    allow_origins=ALLOWED_ORIGINS if ALLOWED_ORIGINS else ["*"],
     allow_credentials=True,
     allow_methods=["*"],
     allow_headers=["*"],