fix: 修复登录响应处理逻辑

- 移除不必要的code检查
- 添加token有效性验证
- 确保userId转换为字符串存储
- 添加错误日志输出

novalon-manage-web/src/views/system/Login.vue

@@ -69,18 +69,26 @@ const onFinish = async () => {
   loading.value = true
   try {
     const res: any = await request.post('/auth/login', formState)
-    if (res.code === 401) {
-      ElMessage.error(res.message || '登录失败')
+    
+    if (!res || !res.token) {
+      ElMessage.error('登录失败：未收到有效响应')
       return
     }
+    
     localStorage.setItem('token', res.token)
-    localStorage.setItem('userId', res.userId)
-    localStorage.setItem('username', res.username)
+    if (res.userId) {
+      localStorage.setItem('userId', String(res.userId))
+    }
+    if (res.username) {
+      localStorage.setItem('username', res.username)
+    }
+    
     ElMessage.success('登录成功')
     
     await router.push('/')
   } catch (error: any) {
-    ElMessage.error(error.response?.data?.message || '登录失败')
+    console.error('登录错误:', error)
+    ElMessage.error(error.response?.data?.message || error.message || '登录失败')
   } finally {
     loading.value = false
   }