feat: optimize settings management and admin functionality

- Add system log cleanup functionality with batch processing
- Optimize v2_settings table performance by unifying value storage
- Add comprehensive client support list for one-click subscription
- Fix QR code subscription links for specific node types
- Fix route addition issues in admin management panel
- Enhance admin system controller with log management APIs

public/assets/admin/locales/ko-KR.js

@@ -1095,7 +1095,7 @@ window.XBOARD_TRANSLATIONS['ko-KR'] = {
       "uri": "URI",
       "requestData": "요청 데이터",
       "exception": "예외",
-      "totalLogs": "총 로그 수: {{count}}",
+      "totalLogs": "총 로그 수",
       "tabs": {
         "all": "전체",
         "info": "정보",