- Fix github.* → gitea.* context consistency
- Add pre-release detection (skip :latest for alpha/beta/rc)
- Add release fallback (reuse existing if creation fails)
- Add prerelease field to release API call
- Use sparse-checkout for RELEASE_NOTES.md
- Skip Portainer redeploy for pre-releases
- Add version tag without v prefix
- Add manual build.yml for Docker image verification
