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

api/composer.json

@@ -7,9 +7,14 @@
     "license": "MIT",
     "require": {
         "php": "^8.2",
+        "barryvdh/laravel-dompdf": "^3.1",
+        "endroid/qr-code": "^6.1",
         "laravel/framework": "^12.0",
         "laravel/sanctum": "^4.0",
-        "laravel/tinker": "^2.10.1"
+        "laravel/tinker": "^2.10.1",
+        "spatie/laravel-activitylog": "^5.0",
+        "spatie/laravel-medialibrary": "^11.21",
+        "spatie/laravel-permission": "^7.2"
     },
     "require-dev": {
         "fakerphp/faker": "^1.23",