feat: Add express-async-errors for improved error handling

- Integrated express-async-errors to automatically handle errors in async route handlers, enhancing the overall error management in the application.
- Updated app.ts to include the express-async-errors import for global error handling.
- Removed redundant logging statements in admin and user menu retrieval functions to streamline the code and improve readability.
- Adjusted logging levels from info to debug for less critical logs, ensuring that important information is logged appropriately without cluttering the logs.

backend-node/src/services/flowStepService.ts

@@ -93,13 +93,6 @@ export class FlowStepService {
     id: number,
     request: UpdateFlowStepRequest
   ): Promise<FlowStep | null> {
-    console.log("🔧 FlowStepService.update called with:", {
-      id,
-      statusColumn: request.statusColumn,
-      statusValue: request.statusValue,
-      fullRequest: JSON.stringify(request),
-    });
-
     // 조건 검증
     if (request.conditionJson) {
       FlowConditionParser.validateConditionGroup(request.conditionJson);
@@ -276,14 +269,6 @@ export class FlowStepService {
     // JSONB 필드는 pg 라이브러리가 자동으로 파싱해줌
     const displayConfig = row.display_config;
 
-    // 디버깅 로그 (개발 환경에서만)
-    if (displayConfig && process.env.NODE_ENV === "development") {
-      console.log(`🔍 [FlowStep ${row.id}] displayConfig:`, {
-        type: typeof displayConfig,
-        value: displayConfig,
-      });
-    }
-
     return {
       id: row.id,
       flowDefinitionId: row.flow_definition_id,