varaverk: monitor overhaul — CPU/memory/network/streams cards; scheduler polish

Monitor tab:
- CPU card: per-core bars (freq-colored), overall usage bar, rolling history chart
- Memory card: breakdown by system/VM/ZFS/Docker/free with progress bars
- Network card: LAN + ext + Tailscale IP display, live RX/TX chart with auto-scale
- Streams card: Emby/Jellyfin/Plex sessions with playback bar and server badges
- GPU card: adds power draw, encode%, decode% meters
- Transcode card: ramdisk vs SSD location pill, session count, flip history
- Canvas chart helpers: vvDrawChart, vvDrawNetChart, vvMeter, vvFmtBps, vvFmtGib

api/monitor.php: adds cpu, mem, net to response payload

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

@@ -3,6 +3,7 @@
 // schedule.json is per-host, never synced.
 
 require_once __DIR__ . '/config.php';
+require_once __DIR__ . '/confform.php';
 
 define('SCHEDULE_FILE', '/boot/config/plugins/varaverk/schedule.json');
 define('CRON_FILE',     '/etc/cron.d/varaverk');
@@ -59,7 +60,7 @@ function vv_cron_rebuild(array $schedule): bool {
         $logDir  = dirname($logFile);
         if (!is_dir($logDir)) mkdir($logDir, 0755, true);
         $flags   = !empty($entry['log_enabled']) ? ' --log' : '';
-        $lines[] = "{$entry['cron']} bash \"$script\"$flags >> \"$logFile\" 2>&1";
+        $lines[] = "{$entry['cron']} bash -c 'echo; echo \"── \$(date \"+%Y-%m-%d %H:%M:%S\") ──────────────────────\"; bash \"$script\"$flags' >> \"$logFile\" 2>&1";
     }
     $lines[] = "";
 
@@ -171,6 +172,25 @@ function vv_script_description(string $path): string {
     return $first;
 }
 
+function vv_custom_scripts(): array {
+    $dir      = SCRIPTS_DIR . '/Custom';
+    $schedule = vv_schedule_load();
+    $scripts  = [];
+    foreach (glob("$dir/*.sh") ?: [] as $path) {
+        $rel       = 'Custom/' . basename($path);
+        $entry     = $schedule[$rel] ?? [];
+        $scripts[] = [
+            'id'          => $rel,
+            'label'       => basename($path, '.sh'),
+            'desc'        => vv_script_description($path),
+            'enabled'     => (bool)($entry['enabled'] ?? false),
+            'cron'        => $entry['cron'] ?? '',
+            'log_enabled' => (bool)($entry['log_enabled'] ?? false),
+        ];
+    }
+    return $scripts;
+}
+
 // Walk the scripts repo and return the job tree:
 // orchestrators as top-level, individual scripts as children
 function vv_job_tree(): array {