fix: remove internal database ID from frontend

Removed from the instance subtitle and the overview kv grid. The auto-
increment ID is an implementation detail with no user-facing meaning.

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

js/ui.js

@@ -172,7 +172,6 @@ async function renderDetailPage(vmid) {
   document.getElementById('detail-vmid-crumb').textContent  = vmid;
   document.getElementById('detail-name').textContent        = inst.name;
   document.getElementById('detail-vmid-sub').textContent    = inst.vmid;
-  document.getElementById('detail-id-sub').textContent      = inst.id;
   document.getElementById('detail-created-sub').textContent = fmtDate(inst.created_at);
 
   document.getElementById('detail-identity').innerHTML = `
@@ -180,7 +179,6 @@ async function renderDetailPage(vmid) {
     <div class="kv-row"><span class="kv-key">state</span><span class="kv-val"><span class="badge ${esc(inst.state)}">${esc(inst.state)}</span></span></div>
     <div class="kv-row"><span class="kv-key">stack</span><span class="kv-val"><span class="badge ${esc(inst.stack)}">${esc(inst.stack) || '—'}</span></span></div>
     <div class="kv-row"><span class="kv-key">vmid</span><span class="kv-val highlight">${inst.vmid}</span></div>
-    <div class="kv-row"><span class="kv-key">internal id</span><span class="kv-val">${inst.id}</span></div>
   `;
 
   document.getElementById('detail-network').innerHTML = `