Services registered via the service API have a domain but no internal
domain (that's a Wild Cloud instance concept). The dnsmasq generator
was producing broken entries like `local=//` and `address=//`.
Fix: skip internal domain entries when InternalDomain is empty, in
both config.go and config_modular.go. Also fix DNS entries to point
to Central's IP (where HAProxy listens) rather than the backend
address — all traffic flows through Central.
Added 3 tests covering: service-only, mixed services+instances.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Extract the Central networking functionality from wild-cloud/api into
a standalone service. Wild Central manages DNS (dnsmasq), gateway
(HAProxy), firewall (nftables), VPN (WireGuard), TLS (certbot),
security (CrowdSec), and DDNS — all the network appliance concerns.
All Cloud-specific code (instances, clusters, nodes, apps, backups,
operations, kubectl/talosctl tooling) has been removed. The API struct
and route registration contain only Central endpoints. Tests updated
to match the new API signature.
Builds and all tests pass.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
