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>

public_html/assets/js/jarvis-app.js

@@ -550,6 +550,21 @@ function renderDO(d) {
       </div>`;
     }).join('');
   }
+
+  // WEB HOST (DO server agent metrics)
+  const ds = d.do_server || {};
+  const doStatus = document.getElementById('do-host-status');
+  const doCpu = document.getElementById('do-cpu');
+  const doMem = document.getElementById('do-mem');
+  const doDisk = document.getElementById('do-disk');
+  if (ds.online) {
+    if (doStatus) { doStatus.textContent = '●'; doStatus.style.color = 'var(--green)'; }
+    if (doCpu) doCpu.textContent = (ds.cpu || 0) + '%';
+    if (doMem) doMem.textContent = (ds.mem || 0) + '%';
+    if (doDisk) doDisk.textContent = (ds.disk || 0) + '%';
+  } else {
+    if (doStatus) { doStatus.textContent = '○'; doStatus.style.color = 'var(--red)'; }
+  }
 }
 
 async function loadNetwork() {