chore: relocate backend into apps/api ahead of monorepo merge

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

apps/api/models/notifications/notification_broadcast.attributes.js

@@ -0,0 +1,24 @@
+// models/notifications/notification_broadcast.attributes.js
+
+// ─── Exclude sets ─────────────────────────────────────────────────────────────
+
+const excludeAttributes = [];
+
+// Admins see everything
+const adminExclude = [
+  ...excludeAttributes,
+];
+
+// ─── JSONB schemas ──────────────────────────────────────────────────────────
+// No JSONB columns on this model.
+const jsonbSchemas = {};
+
+// ─── Computed attributes ──────────────────────────────────────────────────────
+const computedAttributes = [];
+
+module.exports = {
+  excludeAttributes,
+  adminExclude,
+  jsonbSchemas,
+  computedAttributes,
+};