Auto-detect Central domain for CORS allowed origins

Read the configured Central domain from state.yaml and add it as an
HTTPS origin so the web UI at e.g. https://central.payne.io works
without manually setting WILD_CENTRAL_CORS_ORIGINS.

main.go

@@ -15,6 +15,7 @@ import (
 	"github.com/gorilla/mux"
 
 	v1 "github.com/wild-cloud/wild-central/internal/api/v1"
+	"github.com/wild-cloud/wild-central/internal/config"
 	"github.com/wild-cloud/wild-central/internal/frontend"
 	"github.com/wild-cloud/wild-central/internal/logging"
 	"github.com/wild-cloud/wild-central/internal/natsbus"
@@ -36,7 +37,7 @@ func splitAndTrim(s string, sep string) []string {
 	return result
 }
 
-func buildAllowedOrigins() []string {
+func buildAllowedOrigins(dataDir string) []string {
 	if corsOrigins := os.Getenv("WILD_CENTRAL_CORS_ORIGINS"); corsOrigins != "" {
 		origins := splitAndTrim(corsOrigins, ",")
 		slog.Info("CORS configured with explicit origins", "origins", origins)
@@ -69,6 +70,11 @@ func buildAllowedOrigins() []string {
 		"http://127.0.0.1:3000",
 	)
 
+	// Add the configured Central domain (e.g. https://central.payne.io)
+	if cfg, err := config.LoadState(filepath.Join(dataDir, "state.yaml")); err == nil && cfg.Cloud.Central.Domain != "" {
+		allowedOrigins = append(allowedOrigins, "https://"+cfg.Cloud.Central.Domain)
+	}
+
 	return allowedOrigins
 }
 
@@ -102,7 +108,7 @@ func main() {
 		os.Exit(1)
 	}
 
-	allowedOrigins := buildAllowedOrigins()
+	allowedOrigins := buildAllowedOrigins(dataDir)
 
 	api, err := v1.NewAPI(dataDir, Version, allowedOrigins)
 	if err != nil {
@@ -150,10 +156,10 @@ func main() {
 		fmt.Sscanf(v, "%d", &port)
 	}
 
-	// Tell the API what port it's running on, register Central as a service
+	// Tell the API what port it's running on, register Central as a domain
 	// (if a domain is configured), and reconcile all networking.
 	api.SetPort(port)
-	api.EnsureCentralService()
+	api.EnsureCentralDomain()
 	api.Reconcile()
 
 	addr := fmt.Sprintf("%s:%d", host, port)