Two bugs caused DNS to fail when the domain name changes:
1. generate_corefile() hardcoded 'cell' as the zone name instead of
using the configured domain — on startup it would silently reset any
domain change back to 'cell'
2. apply_domain() regex replaced ALL non-dot zones (including local.cell)
with the new domain → duplicate zone blocks → CoreDNS crash
Fix: add a domain parameter to generate_corefile/apply_all_dns_rules,
add _configured_domain() helper in app.py, and delegate Corefile updates
in apply_domain() to generate_corefile() so the logic is in one place.
Also parameterise SERVICE_HOSTS ACL entries via the domain argument.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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