Create API base URL utility for all client code

cgen-188cac9c01b24a52894ae0eae6b12663

client/lib/api-base.ts

@@ -0,0 +1,11 @@
+/**
+ * Get the API base URL
+ * Always uses window.location.origin since the API is served from the same origin
+ * This works for both development (localhost:8080) and production (aethex.dev)
+ */
+export function getApiBase(): string {
+  if (typeof window === "undefined") {
+    return "";
+  }
+  return window.location.origin;
+}