Rewrite the service registration model per the architecture plan:
Model changes:
- Domain is the unique key (removed Name field)
- Removed ExtraDomains — each domain is its own registration
- Removed SourceNode, BackendStatic, ReachOff
- Added Subdomains bool for wildcard matching control
- Files stored as <domain_with_underscores>.yaml
- API routes: /services/{domain:.+} (regex for dots in path)
- Added DeregisterBySource for cleanup before re-registration
Reconciliation changes:
- No ExtraDomains iteration — each service IS one domain
- reach:internal → sets InternalDomain (generates local=/)
- reach:public → sets Domain (no local=/)
- tcp-passthrough → DNS points to backend IP
- http → DNS points to Central IP
All 22 tests pass (9 manager + 8 handler + 5 config/cert).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>