fix(security): P1/P2 审计修复 + JWT HttpOnly Cookie 双模认证 + 限流

- P0/P1 审计修复: 滑块验证码不再下发 x_position/成败即销毁 key、
  user-login 补失败计数+滑块门控、限流标识改 X-Real-IP、
  百度翻译 appkey 环境化、ChangeEmail/ChangePhone 补调 avalidate、
  logs/tasks.py Count(filter=Q) 修复、chat 收藏 SSRF 内网黑名单
- P1 #6/7: token_blacklist + ROTATE_REFRESH_TOKENS 开启,
  /user/token/refresh/ 挂载
- #2 JWT HttpOnly Cookie 双模认证: user/cookie_auth.py 种/清 Cookie,
  user/authentication.py CookieOrHeaderJWTAuthentication(Bearer 优先/_COOKIE 兜底),
  user/views/token.py CookieTokenRefreshView + UserLogoutAPIView(/user/logout/),
  create_standardized_response 自动对含 token 的响应种 Cookie,
  异步视图内 RefreshToken.for_user 全部 sync_to_async 包裹(修 SynchronousOnlyOperation 500),
  WS ChatConsumer 优先读 Cookie token
- P2 #11 限流: utils/rate_limit.py 固定窗口频控,
  shorturl 生成 匿名10次/分+登录60次/分, 邮箱验证码 同邮箱60s1次+同IP10次/10min,
  登录/注册验证码 错5次作废+成功即销毁防重放, 换绑邮箱/手机 同步落地,
  urls.py 补挂 shorturl 路由(此前 404)

user/cookie_auth.py

@@ -0,0 +1,60 @@
+import os
+from django.conf import settings
+
+
+def set_auth_cookies(response, access_token=None, refresh_token=None):
+    """
+    为响应设置 HttpOnly Cookie（杜绝 XSS 窃取 token）
+    - access_token: HttpOnly, SameSite=Lax, Path=/
+    - refresh_token: HttpOnly, SameSite=Lax, Path=/
+    在生产/非 DEBUG 开启 Secure，本地开发/内网环境保持 Secure=False。
+    """
+    if not response:
+        return response
+
+    debug_mode = getattr(settings, 'DJANGO_DEBUG', settings.DEBUG)
+    if isinstance(debug_mode, str):
+        debug_mode = debug_mode.lower() in ('true', '1', 'yes')
+    secure = not debug_mode
+    samesite = 'Lax'
+
+    jwt_settings = getattr(settings, 'SIMPLE_JWT', {})
+
+    if access_token:
+        access_lifetime = jwt_settings.get('ACCESS_TOKEN_LIFETIME')
+        max_age = int(access_lifetime.total_seconds()) if access_lifetime else 7 * 86400
+        response.set_cookie(
+            key='access_token',
+            value=str(access_token),
+            max_age=max_age,
+            httponly=True,
+            samesite=samesite,
+            secure=secure,
+            path='/'
+        )
+
+    if refresh_token:
+        refresh_lifetime = jwt_settings.get('REFRESH_TOKEN_LIFETIME')
+        max_age = int(refresh_lifetime.total_seconds()) if refresh_lifetime else 30 * 86400
+        response.set_cookie(
+            key='refresh_token',
+            value=str(refresh_token),
+            max_age=max_age,
+            httponly=True,
+            samesite=samesite,
+            secure=secure,
+            path='/'
+        )
+
+    return response
+
+
+def clear_auth_cookies(response):
+    """
+    清除认证 HttpOnly Cookie
+    """
+    if not response:
+        return response
+    response.delete_cookie('access_token', path='/')
+    response.delete_cookie('refresh_token', path='/')
+    return response