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/plugins/2.pinia.ts

@@ -0,0 +1,8 @@
+import { createPinia } from 'pinia'
+import type { App } from 'vue'
+
+export const store = createPinia()
+
+export default function (app: App) {
+  app.use(store)
+}