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/package.json

@@ -8,11 +8,8 @@
     "dev": "nodemon server.js",
     "migrate": "node migrations/run-migrations.js",
     "migrate:safe": "node migrations/run-migrations-safe.js",
-    "fix-temp-photos": "node scripts/fix-temp-photos.js",
     "test": "jest",
-    "lint": "eslint src/",
-    "test-backup": "node scripts/test-backup-service.js",
-    "test-restore": "node scripts/test-restore-service.js"
+    "lint": "eslint src/"
   },
   "dependencies": {
     "@aws-sdk/client-s3": "^3.850.0",