api/gallery.php

<?php
require_once __DIR__ . '/config.php';
ensure_dirs();

$galleryFile = RECEIPT_DIR . '/gallery.json';
$entries = [];
if (file_exists($galleryFile)) {
    $entries = read_json_file($galleryFile) ?: [];
}

json_response([
    'ok' => true,
    'entries' => $entries
]);