v0.3.1-beta.1

Beta test release for issue #6 follow-up.

Changes:

• Suggests the compatible entity ID suffix job_z_thickness for the existing internal job_z_thick layer-height sensor key.
• Adds the missing local Home Assistant brand logo.png next to brand/icon.png.
• Clarifies HACS update behavior, manual updates, and entity-ID migration guidance in the README.

Checks:

• python scripts/sync_version.py --check
• python scripts/check_private_data.py
• python scripts/check_release_version.py
• python -m compileall -q custom_components\anycubic_ha_integration scripts
• npm run build
• Release Gate: https://github.com/ljschmitt/hass-anycubic_cloud_v3/actions/runs/28495454957