Add `tmuxido --update` command to update binary from latest release.
- New `self_update` module with version comparison
- Atomic binary replacement with backup/rollback
- Fetches latest release from Gitea API
- Downloads correct binary for system architecture
Replace Gitea packages (served as octet-stream) with a dedicated
orphan branch. Raw branch URL serves SVG with correct content-type.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Replace commit-based badge update with a single PUT to the Gitea
generic packages API. Removes the badges/ directory from the repo
and eliminates CI commits on every push.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
