Route SMS voice uploads through Transfer with wallet billing.

Add a service API for the Ladill SMS platform to store voice recordings in Transfer and charge monthly storage from the customer wallet.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Support/DirectTransferFileUrl.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Support;
+
+use App\Models\QrCode;
+use App\Models\Transfer;
+use App\Models\TransferFile;
+use RuntimeException;
+
+class DirectTransferFileUrl
+{
+    public static function for(Transfer $transfer, TransferFile $file): string
+    {
+        $shortCode = $transfer->qrCode?->short_code;
+        if ($shortCode === null || $shortCode === '') {
+            throw new RuntimeException('Transfer file URL is unavailable.');
+        }
+
+        return QrCode::publicBaseUrl().'/q/'.$shortCode.'/transfer/files/'.$file->id;
+    }
+}