Repo renamed on Gitea (admin/proxmox-controller -> admin/felhom-agent). Updates the
self-name reference in docs/proxmox-platform.md and the controller-source path
(deploy-felhom-compose -> felhom-controller) in the architecture docs. Docs-only; no
code or layout change.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>