feat: add repository pattern, service layer architecture, and scheduler management

- Implement repository pattern for data access layer
- Add comprehensive service layer for business logic
- Create scheduler management system with health monitoring
- Add bounded buffer utility for memory management
- Enhance security audit logging with retention policies

lib/batchSchedulerOptimized.ts

@@ -137,7 +137,7 @@ export function stopOptimizedBatchScheduler(): void {
     { task: retryFailedTask, name: "retryFailedTask" },
   ];
 
-  for (const { task, name: _name } of tasks) {
+  for (const { task, name } of tasks) {
     if (task) {
       task.stop();
       task.destroy();