feat: add Fedora/RHEL RPM package support with comprehensive documentation

Add native RPM package building for Fedora-based distributions:
- Extend electron-builder configuration to include RPM target
- Add rpm-build installation to GitHub Actions CI/CD workflow
- Update artifact upload patterns to include .rpm files
- Declare proper RPM dependencies (gtk3, libnotify, nss, etc.)
- Use xz compression for optimal package size

Documentation:
- Update README.md with Fedora/RHEL installation instructions
- Create comprehensive docs/install-fedora.md guide covering:
  - Installation methods (dnf/yum, direct URL)
  - System requirements and capabilities
  - Configuration and troubleshooting
  - SELinux handling and firewall rules
  - Performance tips and security considerations
  - Building from source
- Support for Fedora 39+, RHEL 9+, Rocky Linux, AlmaLinux

End-to-end support enables Fedora users to install Automaker via:
  sudo dnf install ./Automaker-<version>-x86_64.rpm

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -35,6 +35,11 @@ jobs:
         with:
           check-lockfile: 'true'
 
+      - name: Install RPM build tools (Linux)
+        if: matrix.os == 'ubuntu-latest'
+        shell: bash
+        run: sudo apt-get update && sudo apt-get install -y rpm
+
       - name: Build Electron app (macOS)
         if: matrix.os == 'macos-latest'
         shell: bash
@@ -73,7 +78,7 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: linux-builds
-          path: apps/ui/release/*.{AppImage,deb}
+          path: apps/ui/release/*.{AppImage,deb,rpm}
           retention-days: 30
 
   upload: