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>

backend/scripts/show-admin-credentials.js

@@ -39,8 +39,9 @@ async function showAdminCredentials(resetPassword = false) {
           updated_at: new Date()
         });
       
-      console.log(`Password: ${newPassword} (NEWLY RESET)`);
-      console.log('\n⚠️  IMPORTANT: Please save this password securely!');
+      // Password logging removed for security - check logs or database if needed
+      console.log('Password: [NEWLY RESET - stored in database]');
+      console.log('\n⚠️  IMPORTANT: New password has been set in database!');
     } else {
       console.log('Password: [hidden - use --reset flag to generate new password]');
     }