0.3.0-beta.9

Beta release for testing the cleaned entity naming behavior.

Changes:

• Removes frontend fallbacks for old localized/German entity IDs so the integration, panel, and card consistently use stable English technical entity IDs.
• Keeps German UI/documentation text in translations/docs, while Home Assistant entity names remain English to avoid localized entity-ID drift.
• Updates the README guidance for entity naming and migration behavior.
• Rebuilds the Home Assistant panel and card bundles for 0.3.0-beta.9.

Validation:

• Version files synchronized with scripts/sync_version.py --check.
• Frontend type check passed.
• Panel and card quick builds passed.
• Private-data scan passed.
• Translation entity blocks verified between English and German.