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/admin/src/main.ts

@@ -1,4 +1,5 @@
 import { createApp } from 'vue'
+import { VueQueryPlugin } from '@tanstack/vue-query'
 
 import App from '@/App.vue'
 import { registerPlugins } from '@core/utils/plugins'
@@ -17,6 +18,14 @@ app.config.errorHandler = (err, instance, info) => {
 }
 
 // Register plugins
+app.use(VueQueryPlugin, {
+  queryClientConfig: {
+    defaultOptions: {
+      queries: { staleTime: 1000 * 60 * 5, retry: 1 },
+    },
+  },
+})
+
 try {
   registerPlugins(app)
 } catch (error) {