feat(wake): use checkoutUrl as GraphQL storefront endpoint (#1653)

* feat(wake): use checkoutUrl as GraphQL storefront endpoint

Point the Storefront GraphQL client to ${checkoutUrl}/graphql instead of
the hardcoded https://storefront-api.fbits.net/graphql.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix(wake): normalize storefront GraphQL endpoint and add fallback

Address cubic review: use new URL("/graphql", ...) to avoid a
double-slash when checkoutUrl has a trailing slash, and fall back to
https://${account}.checkout.fbits.store when checkoutUrl is empty,
matching the checkoutApi client.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix(wake): fall back to storefront-api.fbits.net for GraphQL endpoint

Preserve the previous default host when checkoutUrl is empty instead of
pointing at the checkout store.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: guitavano

wake/mod.ts

@@ -109,7 +109,10 @@ For help: https://wakecommerce.readme.io/docs/storefront-api-criacao-e-autentica
   });
   //22e714b360b7ef187fe4bdb93385dd0a85686e2a
   const storefront = createGraphqlClient({
-    endpoint: "https://storefront-api.fbits.net/graphql",
+    endpoint: new URL(
+      "/graphql",
+      checkoutUrl ?? "https://storefront-api.fbits.net",
+    ).href,
     headers: new Headers({ "TCS-Access-Token": `${stringStorefrontToken}` }),
     fetcher: fetchSafe,
   });