Create /var/log/varaverk/ on cron rebuild

/var/log/ is RAM-based on unRAID — wiped on reboot. Creating the log
directory in vv_cron_rebuild() ensures it exists before the first cron
job fires, without needing a separate boot script.

Plugin/usr/local/emhttp/plugins/varaverk/include/scheduler.php

@@ -32,7 +32,11 @@ function vv_schedule_update(string $id, bool $enabled, string $cron): bool {
     return vv_cron_rebuild($schedule);
 }
 
+define('LOG_DIR', '/var/log/varaverk');
+
 function vv_cron_rebuild(array $schedule): bool {
+    if (!is_dir(LOG_DIR)) mkdir(LOG_DIR, 0755, true);
+
     $lines   = ["# Varaverk — managed by plugin, do not edit manually"];
     $lines[] = "# Regenerated: " . date('Y-m-d H:i:s');
     $lines[] = "";
@@ -42,7 +46,7 @@ function vv_cron_rebuild(array $schedule): bool {
         if (empty($entry['enabled']) || empty($entry['cron']) || empty($entry['id'])) continue;
         $script = "$scriptsDir/{$entry['id']}";
         $cron   = $entry['cron'];
-        $lines[] = "$cron " . CRON_USER . " bash \"$script\" >> /var/log/varaverk/jobs.log 2>&1";
+        $lines[] = "$cron " . CRON_USER . " bash \"$script\" >> " . LOG_DIR . "/jobs.log 2>&1";
     }
     $lines[] = "";