Following PR #950 which introduced the RPM spec and systemd unit files,
this adds a comprehensive CI workflow for building, signing, testing, and
publishing RPM packages. Includes GPG signing infrastructure with Ed25519
keys and automatic package registry deployment for stable, development,
and feature branch builds.
Add documentation for RPM installation methods, repository configuration,
and package management. Fix linting issues in spec file for pre-commit
compliance.
The Fedora RPM packaging files added in PR #950 weren't passing pre-commit
checks, causing CI failures for any branches rebased after that merge. This
applies prek linting fixes (typo correction, trailing whitespace removal,
and EOF newline) to ensure CI passes for all contributors.
