refactor: Remove RegisterSelf — Central domain from config

Central no longer self-registers as a service. Its own domain comes
from config (cloud.central.domain) and is injected directly into
reconciliation as an HTTPRoute. This is cleaner — Central's own
services are config-driven, not registration-driven.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/api/v1/handlers.go

@@ -110,39 +110,6 @@ func envOrDefault(key, defaultVal string) string {
 	return defaultVal
 }
 
-// RegisterSelf registers Wild Central's own UI as a service so it gets
-// DNS + proxy + TLS via its own networking stack. Idempotent — safe to
-// call on every startup. Skips silently if no domain is configured.
-func (api *API) RegisterSelf(port int) {
-	globalConfigPath := filepath.Join(api.dataDir, "config.yaml")
-	globalCfg, err := config.LoadGlobalConfig(globalConfigPath)
-	if err != nil {
-		return
-	}
-
-	domain := globalCfg.Cloud.Central.Domain
-	if domain == "" {
-		return
-	}
-
-	svc := services.Service{
-		Source: "wild-central",
-		Domain: domain,
-		Backend: services.Backend{
-			Address: fmt.Sprintf("127.0.0.1:%d", port),
-			Type:    services.BackendHTTP,
-		},
-		Reach: services.ReachInternal,
-		TLS:   services.TLSTerminate,
-	}
-
-	if err := api.services.Register(svc); err != nil {
-		slog.Warn("failed to self-register", "domain", domain, "error", err)
-	} else {
-		slog.Info("registered wild-central", "domain", domain)
-	}
-}
-
 // StartDDNS loads DDNS config and starts the background goroutine.
 func (api *API) StartDDNS(ctx gocontext.Context) {
 	api.ctx = ctx