Adds a new env var HAPROXY_SUSPENSION_BACKEND (default unset). When set
(e.g. "whp-suspended:80"), generate_config() renders:
- A bk_suspended backend pointing at the configured upstream
- An ACL `acl is_suspended_domain hdr(host),lower -f /etc/haproxy/suspended_domains.list`
+ `use_backend bk_suspended if is_suspended_domain` in the frontend,
sitting after IP-blocking and before any per-domain routing
- An empty /etc/haproxy/suspended_domains.list if missing (haproxy refuses
to start with -f pointing at a non-existent file)
External tooling (e.g. WHP's site_disable.php) maintains the list via
`docker cp` and HUP-reloads the container.
Non-WHP deployments (home networks, standalone use) leave the env var
unset and see byte-identical haproxy.cfg output. Same opt-in shape as
the existing HAPROXY_CORAZA_SPOE_BACKEND integration.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
