chore(v5): archive V5 implementation and remove runtime integration

Move V5 source, migrations, UI, scripts, and tests into documentation, then remove V5 routes, models, jobs, configuration, dependencies, and application hooks.

app/Providers/AppServiceProvider.php

@@ -3,10 +3,7 @@
 namespace App\Providers;
 
 use App\Models\PersonalAccessToken;
-use App\Models\V5\Application;
-use App\Support\V5\V5Feature;
 use Illuminate\Database\Eloquent\Model;
-use Illuminate\Database\Eloquent\Relations\Relation;
 use Illuminate\Support\Facades\App;
 use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Http;
@@ -26,11 +23,6 @@ class AppServiceProvider extends ServiceProvider
     {
         $this->configureCommands();
 
-        if (V5Feature::enabled()) {
-            $this->loadMigrationsFrom(database_path('migrations-v5'));
-            $this->configureMorphMap();
-        }
-
         $this->configureModels();
         $this->configurePasswords();
         $this->configureSanctumModel();
@@ -45,18 +37,6 @@ class AppServiceProvider extends ServiceProvider
         }
     }
 
-    /**
-     * Map v5 models to stable morph aliases so polymorphic rows survive class
-     * renames. Deliberately NOT enforced: v4 polymorphic relations store FQCNs
-     * and must keep resolving them.
-     */
-    private function configureMorphMap(): void
-    {
-        Relation::morphMap([
-            'v5.application' => Application::class,
-        ]);
-    }
-
     private function configureModels(): void
     {
         // Disabled because it's causing issues with the application