Sergei 1dd7eb8289 Remove hardcoded credentials and use environment variables ...

- Remove hardcoded database credentials from all scripts
- Remove hardcoded Legacy API tokens from backend scripts
- Remove hardcoded MQTT credentials from mqtt-test.js
- Update backend/.env.example with DB_HOST, DB_USER, DB_PASSWORD, DB_NAME
- Update backend/.env.example with LEGACY_API_TOKEN and MQTT credentials
- Add dotenv config to all scripts requiring credentials
- Create comprehensive documentation:
  - scripts/README.md - Root scripts usage
  - backend/scripts/README.md - Backend scripts documentation
  - MQTT_TESTING.md - MQTT testing guide
  - SECURITY_CREDENTIALS_CLEANUP.md - Security changes summary

All scripts now read credentials from backend/.env instead of hardcoded values.

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

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

2026-01-29 12:13:32 -08:00

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