feat(前端API): 实现运维监控 API 客户端

- 新增 ops API 客户端（ops.ts）
- 扩展 settings API 支持 ops 配置
- 更新 admin API 索引导出 ops 模块
- 扩展 API 客户端支持 WebSocket 连接

frontend/src/api/admin/index.ts

@@ -16,6 +16,7 @@ import usageAPI from './usage'
 import geminiAPI from './gemini'
 import antigravityAPI from './antigravity'
 import userAttributesAPI from './userAttributes'
+import opsAPI from './ops'
 
 /**
  * Unified admin API object for convenient access
@@ -33,7 +34,8 @@ export const adminAPI = {
   usage: usageAPI,
   gemini: geminiAPI,
   antigravity: antigravityAPI,
-  userAttributes: userAttributesAPI
+  userAttributes: userAttributesAPI,
+  ops: opsAPI
 }
 
 export {
@@ -49,7 +51,8 @@ export {
   usageAPI,
   geminiAPI,
   antigravityAPI,
-  userAttributesAPI
+  userAttributesAPI,
+  opsAPI
 }
 
 export default adminAPI