refactor: align codebase with EventCrew domain and trim legacy band stack

- Update API: events, users, policies, routes, resources, migrations
- Remove deprecated models/resources (customers, setlists, invitations, etc.)
- Refresh admin app and docs; remove apps/band

Made-with: Cursor

apps/portal/src/plugins/iconify/package.json

@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}