feat(Sora): 直连生成并移除sora2api依赖

实现直连 Sora 客户端、媒体落地与清理策略\n更新网关与前端配置以支持 Sora 平台\n补齐单元测试与契约测试，新增 curl 测试脚本\n\n测试: go test ./... -tags=unit

frontend/src/api/admin/index.ts

@@ -18,7 +18,6 @@ import geminiAPI from './gemini'
 import antigravityAPI from './antigravity'
 import userAttributesAPI from './userAttributes'
 import opsAPI from './ops'
-import modelsAPI from './models'
 
 /**
  * Unified admin API object for convenient access
@@ -38,8 +37,7 @@ export const adminAPI = {
   gemini: geminiAPI,
   antigravity: antigravityAPI,
   userAttributes: userAttributesAPI,
-  ops: opsAPI,
-  models: modelsAPI
+  ops: opsAPI
 }
 
 export {
@@ -57,8 +55,7 @@ export {
   geminiAPI,
   antigravityAPI,
   userAttributesAPI,
-  opsAPI,
-  modelsAPI
+  opsAPI
 }
 
 export default adminAPI