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/style.css

@@ -80,6 +80,15 @@ body {
     display: none;
 }
 
+.location.ap-location {
+    background: #1a2a2a;
+    border: 1px solid #28a;
+}
+
+.location.ap-location > .location-name {
+    display: none;
+}
+
 .node-row {
     display: flex;
     flex-direction: row;
@@ -274,6 +283,11 @@ body.sacn-mode .node .sacn-hover {
     font-weight: bold;
 }
 
+.node.ap {
+    background: #28a;
+    font-weight: bold;
+}
+
 
 .node.copied {
     outline: 2px solid #fff;