Add Docker stack, Reverb live progress, and duplicate upload detection.

Ship FrankenPHP Compose services with Reverb WebSockets for real-time transcription status, skip re-uploading identical audio via content hash, and format disk usage without requiring intl.

tests/Feature/DiskSpaceTest.php

@@ -5,7 +5,6 @@ namespace Tests\Feature;
 use App\Services\DiskSpaceService;
 use Illuminate\Foundation\Testing\RefreshDatabase;
 use Illuminate\Support\Facades\Cache;
-use Illuminate\Support\Facades\Storage;
 use Tests\TestCase;
 
 class DiskSpaceTest extends TestCase
@@ -39,7 +38,6 @@ class DiskSpaceTest extends TestCase
     public function test_layout_shows_disk_space_bar(): void
     {
         Cache::flush();
-        Storage::fake('local');
 
         $this->get(route('recordings.index'))
             ->assertOk()