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.

database/migrations/2026_08_12_153209_add_content_hash_to_recordings_table.php

@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('recordings', function (Blueprint $table) {
+            $table->string('content_hash', 64)->nullable()->after('file_size_bytes');
+            $table->unique('content_hash');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('recordings', function (Blueprint $table) {
+            $table->dropUnique(['content_hash']);
+            $table->dropColumn('content_hash');
+        });
+    }
+};