feat(nodes): mesh awareness + node detail page

- agent reports tailscale/netbird/zerotier/wireguard interface IPs at
  register (authoritative — absent interfaces clear stored state)
- backend stores under node_agents.metadata.mesh, merged on re-register
- node detail page shows mesh addresses under the primary IP

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/frontend/src/features/nodes/NodeDetailPage.tsx

@@ -156,6 +156,11 @@ export function NodeDetailPage() {
                 {agent.version ? ` · v${agent.version}` : ''}
                 {agent.lastHeartbeat ? ` · heartbeat ${formatRelative(agent.lastHeartbeat)}` : ''}
               </p>
+              {meshAddresses(agent).length > 0 && (
+                <p className="v-mono mt-1 text-[11px] text-[var(--text-tertiary)]">
+                  mesh: {meshAddresses(agent).map(([iface, ip]) => `${iface}=${ip}`).join(' · ')}
+                </p>
+              )}
             </div>
             <div className="flex items-center gap-3">
               <span className={`v-mono text-[11px] px-2 py-1 rounded-md border ${online
@@ -312,6 +317,13 @@ export function NodeDetailPage() {
   );
 }
 
+function meshAddresses(agent: { metadata: Record<string, unknown> }): [string, string][] {
+  const mesh = agent.metadata?.mesh;
+  if (!mesh || typeof mesh !== 'object' || Array.isArray(mesh)) return [];
+  return Object.entries(mesh as Record<string, unknown>)
+    .filter((entry): entry is [string, string] => typeof entry[1] === 'string' && entry[1] !== '');
+}
+
 function Stat({ label, value, sub }: { label: string; value: string; sub?: string }) {
   return (
     <div className="panel p-4">

app/frontend/src/generated/api-types.ts

@@ -12026,6 +12026,10 @@ export interface components {
             capabilities: components["schemas"]["AgentCapabilities"];
             /** @description May also be sent via the X-Agent-Token header */
             auth_token?: string;
+            /** @description Overlay-network interface IPs (tailscale/netbird/zerotier/wireguard). Stored under agent metadata.mesh; authoritative — send an empty object when no mesh interfaces exist. */
+            mesh?: {
+                [key: string]: string;
+            };
         };
         AgentHeartbeat: {
             agent_id?: string;

app/frontend/src/lib/api-client.ts

@@ -342,6 +342,7 @@ export type NodeAgentEntity = {
   capabilities: AgentCapabilities;
   resources: NodeResources;
   autoPrune: boolean;
+  metadata: Record<string, unknown>;
   lastHeartbeat?: string;
   createdAt?: string;
   updatedAt?: string;
@@ -1078,6 +1079,7 @@ function normalizeAgent(agent: RawNodeAgent): NodeAgentEntity | null {
     },
     lastHeartbeat: agent.last_heartbeat,
     autoPrune: agent.auto_prune ?? false,
+    metadata: (agent.metadata ?? {}) as Record<string, unknown>,
     createdAt: agent.created_at,
     updatedAt: agent.updated_at,
   };