refactor(housekeeping): modal confirm, bulk delete, search debounce, audit inline, form reset

- Replace browser confirm() with custom ConfirmModal component
- Add search debounce (300ms) before syncing URL params
- Reset add-permission form after successful submit
- Add bulk select/delete with checkbox column and bulkDeletePermissions action
- AuditSection fetches logs server-side via getAuditLogs and shows inline table
- Add 10 new i18n keys (cancel, confirm, confirmDeletePermission,
  confirmBulkDelete, deleteSelected, confirmClearAllDesc,
  auditTime, auditUser, auditAction, auditTarget) synced to all 22 locales

src/messages/hu.json

@@ -1958,7 +1958,17 @@
 				"auditHint": "All changes to housekeeping permissions are logged.",
 				"auditLogsAt": "Audit logs are available on the Audit log page.",
 				"viewAuditLogs": "View audit logs",
-				"importedWithErrors": "Imported {count} permissions with {errors} errors"
+				"importedWithErrors": "Imported {count} permissions with {errors} errors",
+				"confirmClearAllDesc": "This will remove every permission entry from the database. Are you sure?",
+				"confirmDeletePermission": "Delete this permission permanently?",
+				"confirmBulkDelete": "Delete {count} selected permissions?",
+				"deleteSelected": "Delete {count} selected",
+				"cancel": "Cancel",
+				"confirm": "Confirm",
+				"auditTime": "Time",
+				"auditUser": "User",
+				"auditAction": "Action",
+				"auditTarget": "Target"
 			},
 			"rooms": {
 				"title": "Szobák",