add integration homematicip-hcu

[Phil7989]

Checklist

• I've read the publishing documentation.
• I've added the HACS action to my repository.
• (For integrations only) I've added the hassfest action to my repository.
• The actions are passing without any disabled checks in my repository.
• I've added a link to the action run on my repository below in the links section.
• I've created a new release of the repository after the validation actions were run successfully.

Links

Link to current release: (https://github.com/Ediminator/hacs-homematicip-hcu/releases/tag/2.0.0)
Link to successful HACS action (without the ignore key): (https://github.com/Ediminator/hacs-homematicip-hcu/actions/runs/26430722171)
Link to successful hassfest action (if integration): (https://github.com/Ediminator/hacs-homematicip-hcu/actions/runs/26430722171/job/77803281966)

[hacs-bot]

Add required repository links to the PR description. Found 0 link(s), but 3 are required for integration repositories. Please add links to the repository's latest release and CI action runs, then submit a new PR.