chore: clean up codebase for production readiness

- Remove all console.log/debug statements from production code
- Add NODE_ENV checks for development-only logging
- Remove test scripts (test-feedback, test-image-security, test-backup-*, test-restore)
- Remove one-time fix scripts (fix-temp-photos, fix-migration-state, mark-migration-applied)
- Remove sensitive files (.env.backup, ADMIN_CREDENTIALS.txt)
- Update package.json to remove references to deleted scripts
- Replace console statements with logger utility in backend
- Secure error boundaries to not expose stack traces in production

This makes the codebase production-ready with no debug output or test scripts.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/components/gallery/PhotoRating.tsx

@@ -24,6 +24,8 @@ export const PhotoRating: React.FC<PhotoRatingProps> = ({
   isEnabled,
   onRatingChange
 }) => {
+  // Ensure averageRating is a valid number
+  const safeAverageRating = typeof averageRating === 'number' && !isNaN(averageRating) ? averageRating : 0;
   const { t } = useTranslation();
   const queryClient = useQueryClient();
   const [hoveredRating, setHoveredRating] = useState(0);
@@ -102,7 +104,7 @@ export const PhotoRating: React.FC<PhotoRatingProps> = ({
       {/* Average Rating Display */}
       {totalRatings > 0 && (
         <div className="text-sm text-neutral-600">
-          <span className="font-medium">{averageRating.toFixed(1)}</span>
+          <span className="font-medium">{safeAverageRating.toFixed(1)}</span>
           <span className="text-neutral-400 ml-1">
             ({t('feedback.ratingsCount', '{{count}} ratings', { count: totalRatings })})
           </span>