Allow multiple domains to share the same backend pool using share_with parameter.
This saves pool slots when domains point to the same servers.
- Add share_with parameter to haproxy_add_domain
- Add helper functions for shared domain management
- Protect shared pools from being cleared on domain removal
- Update documentation with pool sharing examples
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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