Add TP-Link AP support with wireless client sub-locations

- Add NodeType enum (switch, ap, wireless_client, wired_client)
- Poll SNMPv2c and SNMPv3 in parallel to win race with ping
- Render APs with bordered sub-locations containing wireless clients
- Fall back to parent interface stats when child lacks them
- Log when unreachable nodes become reachable via merge

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

static/js/nodes.js

@@ -59,7 +59,11 @@ export function getNodeIdentifiers(node) {
 }
 
 export function isSwitch(node) {
-    return !!(node.poe_budget);
+    return node.type === 'switch';
+}
+
+export function isAP(node) {
+    return node.type === 'ap';
 }
 
 export function getSpeedClass(speed) {