feat: 云账号编辑功能 + 通知渠道种子数据 + 修复mock.go编译错误

- 新增 PUT /cloud-accounts/:id 后端端点（UpdateCloudAccount handler + 路由注册）
- 前端 CloudAccountManager 添加编辑弹窗：复用创建表单，凭证留空保持不变
- 修复 scripts/mock.go 编译错误：补充缺失的 generateNotifyChannels 函数（5种通知渠道种子）
- 包含前序未提交的告警通知渠道 CRUD 后端API + AlertManager 通知配置前端UI

frontend/src/services/api.ts

@@ -148,6 +148,22 @@ export const alertApi = {
   acknowledge: async (id: number | string) => {
     return http.post(`/alerts/${id}/ack`);
   },
+  // 通知渠道管理
+  getNotifyChannels: async () => {
+    return http.get('/alerts/notify-channels');
+  },
+  createNotifyChannel: async (data: any) => {
+    return http.post('/alerts/notify-channels', data);
+  },
+  updateNotifyChannel: async (id: number | string, data: any) => {
+    return http.put(`/alerts/notify-channels/${id}`, data);
+  },
+  deleteNotifyChannel: async (id: number | string) => {
+    return http.delete(`/alerts/notify-channels/${id}`);
+  },
+  testNotifyChannel: async (id: number | string) => {
+    return http.post(`/alerts/notify-channels/${id}/test`);
+  },
 };
 
 // ==================== 流水线 API ====================
@@ -311,6 +327,9 @@ export const cloudApi = {
   createAccount: async (data: any) => {
     return http.post('/cloud-accounts', data);
   },
+  updateAccount: async (id: number | string, data: any) => {
+    return http.put(`/cloud-accounts/${id}`, data);
+  },
   deleteAccount: async (id: number | string) => {
     return http.delete(`/cloud-accounts/${id}`);
   },