Honor email-templates.active for order-confirmation

Skips the send entirely when the admin has deliberately deactivated
the order-confirmation template, matching the backend's new toggle for
the 7 order-status emails. Distinct from a missing row, which still
sends with the hardcoded default wording.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/lib/payload.ts

@@ -828,6 +828,11 @@ type PayloadEmailTemplate = {
   heading: string;
   bodyText: string;
   footerText: string | null;
+  // false means the admin deliberately suppressed this email — checked
+  // by orderEmail.ts before sending order-confirmation, never treated as
+  // "row missing, use hardcoded default" (that's what a null return from
+  // this function itself already means).
+  active: boolean;
 };
 
 // draft:true is used by app/email-preview/[type]/page.tsx (Live Preview,