feat: GPT 隐私模式 + no-train 前端展示优化

backend/internal/handler/admin/account_handler.go

@@ -865,6 +865,9 @@ func (h *AccountHandler) refreshSingleAccount(ctx context.Context, account *serv
 		}
 	}
 
+	// OpenAI OAuth: 刷新成功后检查并设置 privacy_mode
+	h.adminService.EnsureOpenAIPrivacy(ctx, updatedAccount)
+
 	return updatedAccount, "", nil
 }
 

backend/internal/handler/admin/admin_service_stub_test.go

@@ -429,5 +429,9 @@ func (s *stubAdminService) ResetAccountQuota(ctx context.Context, id int64) erro
 	return nil
 }
 
+func (s *stubAdminService) EnsureOpenAIPrivacy(ctx context.Context, account *service.Account) string {
+	return ""
+}
+
 // Ensure stub implements interface.
 var _ service.AdminService = (*stubAdminService)(nil)

backend/internal/handler/admin/openai_oauth_handler.go

@@ -289,6 +289,7 @@ func (h *OpenAIOAuthHandler) CreateAccountFromOAuth(c *gin.Context) {
 		Platform:    platform,
 		Type:        "oauth",
 		Credentials: credentials,
+		Extra:       nil,
 		ProxyID:     req.ProxyID,
 		Concurrency: req.Concurrency,
 		Priority:    req.Priority,