refactor(frontend): P0 API 层收口与 http 统一

- 统一 http.ts baseURL：get/post/download/upload 均走 resolveApiUrl
- agentUtils 下沉至 lib/agent-utils，API 层移除对 components 的依赖
- 扩展 metricsApi/snmpApi/prometheusProxyApi/zabbixProxyApi
- 扩展 pipelineApi/credentialApi 覆盖流水线与凭证场景
- 14 个组件/页面禁止直连 http，统一走 @/services/api

frontend/src/components/deploy/FileBrowserDialog.tsx

@@ -17,7 +17,7 @@ import {
   Minimize2,
 } from 'lucide-react';
 import { cn } from '@/lib/utils';
-import http from '@/services/http';
+import { pipelineApi } from '@/services/api';
 import { useUserStore } from '@/store';
 
 interface FileItem {
@@ -69,8 +69,7 @@ export function FileBrowserDialog({
     setLoading(true);
     setError('');
     try {
-      const params = path ? `?path=${encodeURIComponent(path)}` : '';
-      const data = await http.get(`/pipelines/runs/${runId}/files${params}`);
+      const data = await pipelineApi.listRunFiles(runId, path || undefined);
       setListing(data);
       setCurrentPath(data?.current || '');
     } catch (err: any) {