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/CredentialManager.tsx

@@ -34,7 +34,7 @@ import { Dialog, DialogContent, DialogHeader, DialogTitle, DialogDescription, Di
 
 import { toast } from 'sonner';
 import { useConfirm } from '@/components/ui/confirm-dialog';
-import http from '@/services/http';
+import { credentialApi } from '@/services/api';
 
 // ────── Types ──────
 
@@ -85,7 +85,7 @@ function CredDetailDialog({ open, onClose, credId }: { open: boolean; onClose: (
   useEffect(() => {
     if (!credId || !open) return;
     setLoading(true);
-    http.get(`/credentials/${credId}`).then(( res: any) => {
+    credentialApi.get(credId).then(( res: any) => {
       setDetail(res);
     }).catch(() => toast.error('加载详情失败')).finally(() => setLoading(false));
   }, [credId, open]);
@@ -372,10 +372,10 @@ function CredFormDialog({ open, onClose, onSaved, editData }: {
       }
 
       if (isEdit) {
-        await http.put(`/credentials/${editData!.id}`, payload);
+        await credentialApi.update(editData!.id, payload);
         toast.success('已更新');
       } else {
-        await http.post('/credentials', payload);
+        await credentialApi.create(payload);
         toast.success('已创建');
       }
       onSaved();
@@ -643,11 +643,11 @@ export default function CredentialManager() {
   const fetchAll = useCallback(async () => {
     setLoading(true);
     try {
-      const params = new URLSearchParams();
-      if (filterType) params.set('secret_type', filterType);
-      if (filterSearch) params.set('search', filterSearch);
-      params.set('page_size', '100');
-      const res: Record<string, any> = await http.get(`/credentials?${params.toString()}`);
+      const res: Record<string, any> = await credentialApi.list({
+        page_size: 100,
+        ...(filterType ? { secret_type: filterType } : {}),
+        ...(filterSearch ? { search: filterSearch } : {}),
+      });
       setCredentials(res?.list || []);
     } catch { toast.error('获取凭证列表失败'); }
     finally { setLoading(false); }
@@ -664,7 +664,7 @@ export default function CredentialManager() {
     });
     if (!ok) return;
     try {
-      await http.delete(`/credentials/${cred.id}`);
+      await credentialApi.delete(cred.id);
       toast.success('已删除');
       fetchAll();
     } catch { toast.error('删除失败'); }
@@ -672,7 +672,7 @@ export default function CredentialManager() {
 
   const handleToggleActive = async (cred: Credential) => {
     try {
-      await http.put(`/credentials/${cred.id}`, { is_active: !cred.is_active });
+      await credentialApi.toggleActive(cred.id, !cred.is_active);
       toast.success(cred.is_active ? '已禁用' : '已启用');
       fetchAll();
     } catch { toast.error('操作失败'); }