feat(instance): public profile endpoint GET /api/instance (hub-app M1)

src/lib/env/env.go

@@ -32,3 +32,10 @@ func IsDev() bool {
 func GiteaURL() string {
 	return os.Getenv("DCNTRLIZED_GITEA_URL")
 }
+
+// PublicProfile reports whether the unauthenticated instance profile
+// (GET /api/instance, hub-app theme M1) is served. Default on; set
+// DCNTRLIZED_PUBLIC_PROFILE=false to blank services + trusted_instances.
+func PublicProfile() bool {
+	return os.Getenv("DCNTRLIZED_PUBLIC_PROFILE") != "false"
+}