feat: add DO server (web host) monitoring block to JARVIS Server panel

- /api/do now includes do_server key with jarvis-do agent metrics
  (CPU, RAM, disk, uptime from Tailscale-connected DO server agent)
- Front page JARVIS SERVER panel has WEB HOST section with live
  CPU/RAM/DISK bars from DO server agent data
- Panel title updated to show 10.48.200.211 (JARVIS VM IP)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/endpoints/do_server.php

@@ -59,6 +59,22 @@ foreach ($rows as $r) {
 $uptimeDays = intdiv($uptime, 86400);
 $uptimeHrs  = intdiv($uptime % 86400, 3600);
 
+
+// DO server agent metrics (jarvis-do agent reporting via Tailscale)
+$doAgent = JarvisDB::query(
+    "SELECT metric_data FROM agent_metrics WHERE agent_id='jarvis-do_orbis' AND metric_type='system' ORDER BY recorded_at DESC LIMIT 1"
+);
+$doMet = [];
+if (!empty($doAgent[0]['metric_data'])) {
+    $dm = json_decode($doAgent[0]['metric_data'], true) ?? [];
+    $doMet = [
+        "cpu"    => $dm['cpu_percent'] ?? 0,
+        "mem"    => $dm['memory']['percent'] ?? 0,
+        "disk"   => (int)($dm['disk'][0]['percent'] ?? 0),
+        "uptime" => $dm['uptime']['human'] ?? "--",
+        "online" => true,
+    ];
+}
 echo json_encode([
     "ip"           => "10.48.200.211",  // JARVIS VM (PVE1)
     "reachable"    => true,
@@ -73,5 +89,6 @@ echo json_encode([
     "uptime"       => "{$uptimeDays}d {$uptimeHrs}h",
     "services"     => $svcMap,
     "sites"        => $sites,
+    "do_server"    => $doMet,
     "timestamp"    => date("c"),
 ]);