refactor: use forceCreate() for internal model creation

Replace create() with forceCreate() across internal model creation operations to bypass mass assignment protection. This is appropriate for internal code that constructs complete model state without user input.

Add InternalModelCreationMassAssignmentTest to ensure internal model creation behavior is properly tested. Optimize imports by using shortened Livewire attribute references and removing unused imports.

app/Livewire/Boarding/Index.php

@@ -9,6 +9,7 @@ use App\Models\Server;
 use App\Models\Team;
 use App\Services\ConfigurationRepository;
 use Illuminate\Support\Collection;
+use Livewire\Attributes\Url;
 use Livewire\Component;
 use Visus\Cuid2\Cuid2;
 
@@ -19,18 +20,18 @@ class Index extends Component
         'prerequisitesInstalled' => 'handlePrerequisitesInstalled',
     ];
 
-    #[\Livewire\Attributes\Url(as: 'step', history: true)]
+    #[Url(as: 'step', history: true)]
     public string $currentState = 'welcome';
 
-    #[\Livewire\Attributes\Url(keep: true)]
+    #[Url(keep: true)]
     public ?string $selectedServerType = null;
 
     public ?Collection $privateKeys = null;
 
-    #[\Livewire\Attributes\Url(keep: true)]
+    #[Url(keep: true)]
     public ?int $selectedExistingPrivateKey = null;
 
-    #[\Livewire\Attributes\Url(keep: true)]
+    #[Url(keep: true)]
     public ?string $privateKeyType = null;
 
     public ?string $privateKey = null;
@@ -45,7 +46,7 @@ class Index extends Component
 
     public ?Collection $servers = null;
 
-    #[\Livewire\Attributes\Url(keep: true)]
+    #[Url(keep: true)]
     public ?int $selectedExistingServer = null;
 
     public ?string $remoteServerName = null;
@@ -66,7 +67,7 @@ class Index extends Component
 
     public Collection $projects;
 
-    #[\Livewire\Attributes\Url(keep: true)]
+    #[Url(keep: true)]
     public ?int $selectedProject = null;
 
     public ?Project $createdProject = null;
@@ -440,7 +441,7 @@ class Index extends Component
 
     public function createNewProject()
     {
-        $this->createdProject = Project::create([
+        $this->createdProject = Project::forceCreate([
             'name' => 'My first project',
             'team_id' => currentTeam()->id,
             'uuid' => (string) new Cuid2,