test(后端): 更新 API 契约测试支持 ops 监控端点

- 更新 api_contract_test.go 包含 ops 相关端点测试

backend/internal/server/api_contract_test.go

@@ -317,7 +317,9 @@ func TestAPIContracts(t *testing.T) {
 					"fallback_model_gemini": "gemini-2.5-pro",
 					"fallback_model_openai": "gpt-4o",
 					"enable_identity_patch": true,
-					"identity_patch_prompt": ""
+					"identity_patch_prompt": "",
+					"ops_monitoring_enabled": true,
+					"ops_realtime_monitoring_enabled": true
 				}
 			}`,
 		},