fix: resolve 'Invalid Date' issue for user creation time

routes/auth.ts

@@ -43,7 +43,8 @@ router.post('/login', async (req: Request<{}, {}, LoginRequest>, res: Response):
         username: user.username,
         name: user.name,
         email: user.email,
-        role: user.role
+        role: user.role,
+        createdAt: user.created_at
       }
     });
   } catch (error) {
@@ -64,7 +65,14 @@ router.get('/profile', authenticateToken, async (req: Request, res: Response): P
       return;
     }
 
-    res.json(user);
+    res.json({
+      id: user.id,
+      username: user.username,
+      name: user.name,
+      email: user.email,
+      role: user.role,
+      createdAt: user.created_at
+    });
   } catch (error) {
     console.error('获取用户信息错误:', error);
     res.status(500).json({ error: '服务器内部错误' });
@@ -134,7 +142,14 @@ router.put('/profile', authenticateToken, async (req: Request, res: Response): P
       [req.user!.id]
     );
 
-    res.json(updatedUser);
+    res.json({
+      id: updatedUser!.id,
+      username: updatedUser!.username,
+      name: updatedUser!.name,
+      email: updatedUser!.email,
+      role: updatedUser!.role,
+      createdAt: updatedUser!.created_at
+    });
   } catch (error) {
     console.error('更新用户资料错误:', error);
     res.status(500).json({ error: '服务器内部错误' });