Added FreeBSD amd64 and arm64 build targets to the release process:
- Build host-agent and unified agent binaries for FreeBSD
- Package FreeBSD tarballs in releases
- Include FreeBSD binaries in universal tarball for download endpoint
Updated agent install script with FreeBSD support:
- Fixed architecture detection (FreeBSD reports 'amd64' not 'x86_64')
- Added FreeBSD rc.d service handler with proper daemon management
- Automatic service enabling via rc.conf
This enables users to run the Pulse agent on FreeBSD-based systems
like OPNsense, pfSense, and vanilla FreeBSD.
Fixes#1041