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>

index.html

@@ -69,7 +69,6 @@
             <div class="detail-name" id="detail-name">—</div>
             <div class="detail-sub">
               <span><span class="lbl">vmid</span> <span class="val" id="detail-vmid-sub">—</span></span>
-              <span><span class="lbl">id</span> <span class="val" id="detail-id-sub">—</span></span>
               <span><span class="lbl">created</span> <span class="val" id="detail-created-sub">—</span></span>
             </div>
           </div>