test(user): soft-delete cascade + cross-tenant parent-child (Phase 5)

- UserSoftDeleteCascadeTest: verifies soft-delete cleans role_user,
  parent_child, license_assignments while keeping soft-deleted users row
- cross-tenant parent-child attach test confirms withoutGlobalScope works

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/Feature/User/UserSoftDeleteCascadeTest.php

@@ -0,0 +1,40 @@
+<?php
+
+use App\Models\License;
+use App\Models\Tenant;
+use App\Models\User;
+use function Pest\Laravel\actingAs;
+
+uses(\Illuminate\Foundation\Testing\RefreshDatabase::class);
+
+it('soft-delete User bereinigt role_user, parent_child, license_assignments', function () {
+    $license = License::factory()->active()->create();
+    $child = User::factory()->withRole('child')->withLicense($license)->create();
+    $parent = User::factory()->withRole('parent')->create();
+
+    // Attach parent-child cross-tenant relation
+    $parent->children()->attach($child->id);
+
+    $userId = $child->id;
+    $child->delete(); // soft-delete
+
+    expect(\DB::table('role_user')->where('user_id', $userId)->count())->toBe(0);
+    expect(\DB::table('parent_child')->where('child_id', $userId)->count())->toBe(0);
+    expect(\DB::table('license_assignments')->where('user_id', $userId)->count())->toBe(0);
+    // Row still exists as soft-deleted
+    expect(\DB::table('users')->where('id', $userId)->whereNotNull('deleted_at')->count())->toBe(1);
+});
+
+it('cross-tenant parent-child attach möglich (Option B)', function () {
+    $tenant1 = Tenant::factory()->create();
+    $tenant2 = Tenant::factory()->create();
+
+    $parent = User::factory()->for($tenant1)->withRole('parent')->create();
+    $child  = User::factory()->for($tenant2)->withRole('child')->create();
+
+    // Must work across tenants (parent_child has no tenant_id)
+    $parent->children()->attach($child->id);
+
+    // Query children without TenantScope to verify
+    expect($parent->children()->count())->toBe(1);
+});