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/app/Http/Requests/Api/V1/StoreOrganisationRequest.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Http\Requests\Api\V1;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+final class StoreOrganisationRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /** @return array<string, mixed> */
+    public function rules(): array
+    {
+        return [
+            'name' => ['required', 'string', 'max:255'],
+            'slug' => ['required', 'string', 'max:255', 'unique:organisations,slug', 'regex:/^[a-z0-9-]+$/'],
+            'billing_status' => ['sometimes', 'string', 'in:active,trial,suspended'],
+            'settings' => ['sometimes', 'array'],
+        ];
+    }
+}