Refactor useSyncSettings hook

Refactor the useSyncSettings hook to improve code quality and maintain consistency with other files.

src/hooks/sync/index.ts

@@ -0,0 +1,10 @@
+
+// 주요 동기화 훅 내보내기
+export * from './useSyncToggle';
+export * from './useManualSync';
+export * from './useSyncStatus';
+export * from './syncTime';
+export * from './syncResultHandler';
+export * from './syncPerformer';
+export * from './syncNetworkChecker';
+export * from './syncBackupUtils';

src/hooks/useSyncSettings.ts

@@ -1,9 +1,7 @@
 
 import { useState, useEffect } from 'react';
 import { useAuth } from '@/contexts/auth';
-import { useSyncToggle } from './sync/useSyncToggle';
+import { useSyncToggle, useManualSync, useSyncStatus } from './sync';
-import { useManualSync } from './sync/useManualSync';
-import { useSyncStatus } from './sync/useSyncStatus';
 
 /**
  * 동기화 설정 관리를 위한 커스텀 훅