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/app/src/navigation/vertical/index.ts

@@ -0,0 +1,12 @@
+export default [
+  {
+    title: "Home",
+    to: { name: "root" },
+    icon: { icon: "tabler-smart-home" },
+  },
+  {
+    title: "Events",
+    to: { name: "events" },
+    icon: { icon: "tabler-calendar-event" },
+  },
+];