Two fixes for FreeBSD agent support:
1. The Docker image never built or included FreeBSD agent binaries, causing
404 errors when FreeBSD clients requested the download. Added FreeBSD
amd64/arm64 cross-compilation for both host-agent and unified-agent,
plus COPY statements to include them in the image. Also added bare
FreeBSD binaries to GitHub release assets for the redirect fallback.
2. pfSense does not use the standard FreeBSD rc.d boot system — scripts
in /usr/local/etc/rc.d/ must end in .sh to run at boot. The installer
now detects pfSense and creates a .sh boot wrapper alongside the
standard rc.d script. Also added -r flag to daemon for auto-restart.
Related to #1051
7346d48872