feat: expose backend url in admin options (#7370)

packages/core/types/src/common/config-module.ts

@@ -33,6 +33,10 @@ export type AdminOptions = {
    * The default value is `./build`.
    */
   outDir?: string
+  /**
+   * The URL of your Medusa server. Defaults to an empty string, which means requests will hit the same server that serves the dashboard.
+   */
+  backendUrl?: string
   /**
    * Configure the Vite configuration for the admin dashboard. This function receives the default Vite configuration
    * and returns the modified configuration. The default value is `undefined`.