v3.0.0-legacy

Summary

• Remove unsupported version key from hacs.json
• Add Hungarian (hu.json) translations
• Complete missing English translation keys
• Keep HACS metadata limited to accepted fields

Notes

The remaining HACS validation failures are repository settings, not code changes:

• Enable GitHub Issues
• Add valid repository topics such as home-assistant, hacs, hass-agent, custom-component, integration