refactor(frontend): services/api 迁至 src/api，http 迁至 utils/request

对齐 Vue 后台惯例：
- src/api/          域 API（原 services/api）
- src/utils/request.ts  HTTP 封装（原 services/http.ts）
- src/utils/export.ts  客户端导出工具
- src/utils/index.ts   工具统一出口

全局导入改为 @/api 与 @/utils/request，tsc + build 通过。

frontend/src/components/deploy/DeployCredentials.tsx

@@ -9,7 +9,7 @@ import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@
 import { Dialog, DialogContent, DialogHeader, DialogTitle } from '@/components/ui/dialog';
 import { toast } from 'sonner';
 import { useConfirm } from '@/components/ui/confirm-dialog';
-import { deployApi } from '@/services/api';
+import { deployApi } from '@/api';
 import CredentialFormDialog from './CredentialFormDialog';
 import ToolConfigTab from './ToolConfigTab';