Scheduler: card layout, per-job logs, live log panel

- Per-job log files replace single jobs.log: each script writes to
  /var/log/varaverk/<Category>/<script>.log mirroring the job ID
- api/log.php: serves last 200 lines of a job's log file with mtime
  timestamp; supports POST ?clear=1 to truncate
- Scheduler page redesigned as full-width cards (one per orchestrator)
  with Save + Log buttons; Log toggles an inline panel that polls
  every 3 seconds and auto-scrolls — same pattern as unRAID User Scripts
- Children shown under Advanced with identical per-job log panels
- CSS: vv-sched-card, vv-log-panel, vv-log-pre, vv-btn-sm

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

@@ -34,6 +34,10 @@ function vv_schedule_update(string $id, bool $enabled, string $cron): bool {
 
 define('LOG_DIR', '/var/log/varaverk');
 
+function vv_job_log_path(string $id): string {
+    return LOG_DIR . '/' . preg_replace('/\.sh$/', '.log', $id);
+}
+
 function vv_cron_rebuild(array $schedule): bool {
     if (!is_dir(LOG_DIR)) mkdir(LOG_DIR, 0755, true);
 
@@ -44,9 +48,11 @@ function vv_cron_rebuild(array $schedule): bool {
     $scriptsDir = SCRIPTS_DIR;
     foreach ($schedule as $entry) {
         if (empty($entry['enabled']) || empty($entry['cron']) || empty($entry['id'])) continue;
-        $script = "$scriptsDir/{$entry['id']}";
-        $cron   = $entry['cron'];
-        $lines[] = "$cron " . CRON_USER . " bash \"$script\" >> " . LOG_DIR . "/jobs.log 2>&1";
+        $script  = "$scriptsDir/{$entry['id']}";
+        $logFile = vv_job_log_path($entry['id']);
+        $logDir  = dirname($logFile);
+        if (!is_dir($logDir)) mkdir($logDir, 0755, true);
+        $lines[] = "{$entry['cron']} " . CRON_USER . " bash \"$script\" >> \"$logFile\" 2>&1";
     }
     $lines[] = "";