修复认证问题：支持从 Cookie 读取 token

- 修复 require_user 和 require_admin 函数只从 Header 读取 token 的问题
- 新增 get_token_from_request 函数，优先从 Cookie 读取 token，其次从 Header 读取
- 更新所有认证相关函数以支持 Cookie 和 Header 两种认证方式
- 解决 /api/admin/api-keys 等接口返回未登录错误的问题

src/vitals/web/app.py

@@ -448,9 +448,26 @@ def get_token_from_header(authorization: Optional[str] = Header(None)) -> Option
     return None
 
 
-def get_current_user(authorization: Optional[str] = Header(None)) -> Optional[User]:
+def get_token_from_request(
+    request: Request,
+    authorization: Optional[str] = Header(None),
+    auth_token: Optional[str] = Cookie(None)
+) -> Optional[str]:
+    """从 Cookie 或 Header 中获取 Token（优先 Cookie）"""
+    # 优先从 Cookie 获取
+    if auth_token:
+        return auth_token
+    # 其次从 Header 获取（向后兼容）
+    return get_token_from_header(authorization)
+
+
+def get_current_user(
+    request: Request,
+    authorization: Optional[str] = Header(None),
+    auth_token: Optional[str] = Cookie(None)
+) -> Optional[User]:
     """获取当前登录用户（可选，返回 None 表示未登录）"""
-    token = get_token_from_header(authorization)
+    token = get_token_from_request(request, authorization, auth_token)
     if not token:
         return None
     payload = decode_token(token)
@@ -462,25 +479,37 @@ def get_current_user(authorization: Optional[str] = Header(None)) -> Optional[Us
     return user
 
 
-def require_user(authorization: Optional[str] = Header(None)) -> User:
+def require_user(
+    request: Request,
+    authorization: Optional[str] = Header(None),
+    auth_token: Optional[str] = Cookie(None)
+) -> User:
     """要求用户登录（必须认证）"""
-    user = get_current_user(authorization)
+    user = get_current_user(request, authorization, auth_token)
     if not user:
         raise HTTPException(status_code=401, detail="未登录或登录已过期")
     return user
 
 
-def require_admin(authorization: Optional[str] = Header(None)) -> User:
+def require_admin(
+    request: Request,
+    authorization: Optional[str] = Header(None),
+    auth_token: Optional[str] = Cookie(None)
+) -> User:
     """要求管理员权限"""
-    user = require_user(authorization)
+    user = require_user(request, authorization, auth_token)
     if not user.is_admin:
         raise HTTPException(status_code=403, detail="需要管理员权限")
     return user
 
 
-def get_current_user_id(authorization: Optional[str] = Header(None)) -> int:
+def get_current_user_id(
+    request: Request,
+    authorization: Optional[str] = Header(None),
+    auth_token: Optional[str] = Cookie(None)
+) -> int:
     """获取当前用户 ID（兼容模式：未登录时使用活跃用户）"""
-    user = get_current_user(authorization)
+    user = get_current_user(request, authorization, auth_token)
     if user:
         return user.id
     # 兼容模式：未登录时使用当前活跃用户