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/env.d.ts

@@ -0,0 +1,12 @@
+import 'vue-router'
+declare module 'vue-router' {
+  interface RouteMeta {
+    action?: string
+    subject?: string
+    layoutWrapperClasses?: string
+    navActiveLink?: RouteLocationRaw
+    layout?: 'blank' | 'default'
+    unauthenticatedOnly?: boolean
+    public?: boolean
+  }
+}