v2.1.2 Maintenance Release

[D-N91]

v2.1.2 - Documentation Fix & HACS Preparation
This maintenance release ensures that the documentation and versioning are perfectly aligned as we prepare for the official HACS store inclusion.

What's New?
HACS README Sync: Fixed an issue where the HACS store was showing outdated documentation. The latest instructions and project goals are now correctly displayed.

Manifest Alignment: Version bumped to 2.1.2 in manifest.json to ensure seamless update tracking within Home Assistant.

Branding Preparation: Finalized the internal metadata structure to support the upcoming branding merge from the home-assistant/brands repository.

Under the Hood
Improved repository health by cleaning up metadata.

Pre-checks for the upcoming v2.2 logic (Zombie-Ratio and Core-Integrations monitoring).

Note for Power Users: If you are testing via a custom repository in HACS, please use the "Update Information" button to see the latest README changes immediately.

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This discussion was created from the release v2.1.2 Maintenance Release.