Redesign topology diagram with dual-homed bus layout and improve inspector chassis

- Replace flat topology with tiered bus-bar layout: Internet → UDM-Pro → SVG fork → USW-Agg + Pro 24 PoE → dual-homed servers
- Show 10G VLAN90 (Ceph) bus from USW-Agg and 1G DHCP management bus from Pro 24 PoE per host
- Add per-host drop wires (solid 10G + dashed 1G) with correct rack positions
- Mark large1 as off-rack (dashed border), ZimaBoards as off-rack mon-01/mon-02
- Add topology legend, inter-switch 10G ISL indicator
- Add recently resolved events section (last 24h) to dashboard
- Add last_seen column and relative timestamps to events table
- Add stale data banner when monitoring data >15 min old
- Improve inspector chassis with port speed labels, LLDP neighbor info, mounting ears, chassis legend
- Add duplex/speed mismatch warnings and carrier changes to path debug panel
- Bump updateTopology() to handle both topo-v2-status-* and topo-status-* classes

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

static/app.js

@@ -109,7 +109,9 @@ function updateTopology(hosts) {
     const name = node.dataset.host;
     const host = hosts[name];
     if (!host) return;
+    node.className = node.className.replace(/topo-v2-status-(up|down|degraded|unknown)/g, '');
     node.className = node.className.replace(/topo-status-(up|down|degraded|unknown)/g, '');
+    node.classList.add(`topo-v2-status-${host.status}`);
     node.classList.add(`topo-status-${host.status}`);
     const badge = node.querySelector('.topo-badge');
     if (badge) {