1. Add IPOverride field to ClusterEndpoint struct
- Allows users to specify a custom IP that takes precedence over auto-discovered IPs
- Fixes#929 and #1066 where Pulse used internal cluster IPs instead of management IPs
- Added EffectiveIP() method to cleanly handle the override logic
2. Update connection code to use EffectiveIP()
- monitor.go: Use override when building endpoint URLs
- temperature_proxy.go: Use override for proxy connections
3. Add bare Windows EXE files to GitHub releases
- Fixes#1064 where LXC/barebone installs couldn't download Windows agents
- Modified build-release.sh to copy EXEs alongside ZIPs
- Added EXEs to checksum generation
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