Add chunked uploads and raise storage rate to GHS 0.30/GB/month.

Large files upload in 5 MB chunks (hosting file manager pattern) for the
transfer UI and Ladill Mail S2S API, with no app-level file size cap when
TRANSFER_MAX_FILE_BYTES=0.

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

routes/api.php

@@ -1,5 +1,6 @@
 <?php
 
+use App\Http\Controllers\Api\ChunkedUploadController;
 use App\Http\Controllers\Api\MeController;
 use App\Http\Controllers\Api\QrCodeController;
 use App\Http\Controllers\Api\TransferController;
@@ -7,6 +8,9 @@ use Illuminate\Support\Facades\Route;
 
 Route::middleware('auth.service:transfer')->prefix('v1')->group(function () {
     Route::post('/transfers', [TransferController::class, 'store']);
+    Route::post('/transfers/upload/init', [ChunkedUploadController::class, 'init']);
+    Route::post('/transfers/upload/chunk', [ChunkedUploadController::class, 'chunk']);
+    Route::post('/transfers/upload/finalize', [ChunkedUploadController::class, 'finalize']);
 });
 
 Route::middleware(['auth:sanctum', \App\Http\Middleware\SetActingAccount::class])->prefix('v1')->group(function () {