Clean up url resolution

utils/apiUrl.ts

@@ -0,0 +1,9 @@
+/**
+ * resolve the Pullfrog API base URL.
+ *
+ * in the action: API_URL is not explicitly set, so this falls back to https://pullfrog.com.
+ * in local dev: API_URL=http://localhost:3000 (from .env).
+ */
+export function getApiUrl(): string {
+  return process.env.API_URL || "https://pullfrog.com";
+}