feat(AI): add ai manager admin and create powerpoint with ai

app/Http/Controllers/Admin/GenerationDownloadController.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Http\Controllers\Admin;
+
+use App\Enums\TemplateGenerationStatus;
+use App\Http\Controllers\Controller;
+use App\Models\TemplateGeneration;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Storage;
+use Symfony\Component\HttpFoundation\StreamedResponse;
+
+class GenerationDownloadController extends Controller
+{
+    public function __invoke(Request $request, TemplateGeneration $generation): StreamedResponse
+    {
+        $user = $request->user();
+
+        abort_unless($user && ($user->hasRole('admin') || $user->hasPermission('templates.manage')), 403);
+        abort_if($generation->status !== TemplateGenerationStatus::Completed || ! $generation->output_path, 404);
+
+        return Storage::disk('local')->download($generation->output_path, $generation->template->slug.'.pptx');
+    }
+}