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.

routes/channels.php

@@ -0,0 +1,17 @@
+<?php
+
+use Illuminate\Support\Facades\Broadcast;
+
+/*
+|--------------------------------------------------------------------------
+| Broadcast Channels
+|--------------------------------------------------------------------------
+|
+| Transcription updates use the public "recordings" channel (no auth).
+| Private channel stubs can be added here when the app gains users.
+|
+*/
+
+Broadcast::channel('App.Models.User.{id}', function ($user, $id) {
+    return (int) $user->id === (int) $id;
+});