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>

ROADMAP2.md

@@ -260,9 +260,10 @@ and wired refs, one click or one CLI call.
   served at `/api/agents/download/{linux-amd64,linux-arm64}` (install
   script falls back to GH releases). `cli/commands/nodes_add.go`,
   `api/assets/install-agent.sh`, `agents.go:ServeInstallScript`/`ServeAgentBinary`.
-- [ ] **Mesh awareness** — agent detects + reports tailscale0/netbird0/
+- [x] **Mesh awareness** — agent reports tailscale/netbird/wireguard/
-  zt0 IPs at register; backend stores + displays. Optional
+  zerotier interface IPs at register (`mesh` field, authoritative on
-  `TAILSCALE_AUTH_KEY` enroll-at-provision later.
+  re-register), stored in `node_agents.metadata.mesh`, shown on the node
+  detail page. `TAILSCALE_AUTH_KEY` enroll-at-provision still open.
 - [x] **Node detail page** — `/nodes/:id` (admin): heartbeat telemetry
   (cpu/mem sparklines over 1h/24h/7d via `GET /agents/:id/metrics`),
   containers, command history, rename, auto-prune toggle, prune-now,

app/backend/cmd/agent/main.go

@@ -167,6 +167,8 @@ func register(ctx context.Context, client *http.Client, cfg agentConfig) (string
 		"ip_address":   cfg.IP,
 		"port":         cfg.Port,
 		"capabilities": detectCapabilities(),
+		// Always send mesh so a removed interface clears stored state.
+		"mesh": detectMeshInterfaces(),
 	}
 	var response registerResponse
 	if err := postJSON(ctx, client, cfg, "/api/agents/register", payload, &response); err != nil {
@@ -372,6 +374,42 @@ func detectCapabilities() capabilities {
 	}
 }
 
+// detectMeshInterfaces reports overlay-network interface IPs (tailscale,
+// netbird, zerotier, wireguard) so the backend can display reachable
+// mesh addresses alongside the primary IP.
+func detectMeshInterfaces() map[string]string {
+	ifaces, err := net.Interfaces()
+	if err != nil {
+		return nil
+	}
+	mesh := map[string]string{}
+	for _, iface := range ifaces {
+		name := strings.ToLower(iface.Name)
+		isMesh := strings.HasPrefix(name, "tailscale") || strings.HasPrefix(name, "ts.") ||
+			strings.HasPrefix(name, "netbird") || strings.HasPrefix(name, "wt") ||
+			strings.HasPrefix(name, "zt") || strings.HasPrefix(name, "wg")
+		if !isMesh || iface.Flags&net.FlagUp == 0 {
+			continue
+		}
+		addrs, err := iface.Addrs()
+		if err != nil {
+			continue
+		}
+		for _, addr := range addrs {
+			ip, _, err := net.ParseCIDR(addr.String())
+			if err != nil || ip.IsLoopback() {
+				continue
+			}
+			if v4 := ip.To4(); v4 != nil {
+				mesh[iface.Name] = v4.String()
+			} else if _, exists := mesh[iface.Name]; !exists {
+				mesh[iface.Name] = ip.String()
+			}
+		}
+	}
+	return mesh
+}
+
 func collectResources(ip string) nodeResources {
 	mem := readMemory()
 	storage := readStorage("/")

app/backend/internal/api/agents.go

@@ -331,6 +331,7 @@ func (h *NodeAgentHandler) RegisterAgent(c *gin.Context) {
 		Port         int               `json:"port" binding:"required"`
 		Capabilities AgentCapabilities `json:"capabilities" binding:"required"`
 		AuthToken    string            `json:"auth_token"`
+		Mesh         map[string]string `json:"mesh"`
 	}
 
 	if err := c.ShouldBindJSON(&req); err != nil {
@@ -345,12 +346,28 @@ func (h *NodeAgentHandler) RegisterAgent(c *gin.Context) {
 	}
 
 	ctx := c.Request.Context()
+	metadata := map[string]interface{}{}
+	// req.Mesh is authoritative when present (newer agents always send it,
+	// possibly empty); nil means an older agent — keep any stored value.
+	if req.Mesh != nil {
+		metadata["mesh"] = req.Mesh
+	}
 
 	// Re-registering an existing host updates it in place.
 	if existing, err := h.q.GetAgentByHostAndIP(ctx, sqlcdb.GetAgentByHostAndIPParams{
 		Hostname:  req.Hostname,
 		IpAddress: req.IPAddress,
 	}); err == nil {
+		if existing.Metadata.Valid && len(existing.Metadata.RawMessage) > 0 {
+			var prev map[string]interface{}
+			if err := json.Unmarshal(existing.Metadata.RawMessage, &prev); err == nil {
+				for k, v := range prev {
+					if _, ok := metadata[k]; !ok {
+						metadata[k] = v
+					}
+				}
+			}
+		}
 		updated, err := h.q.UpdateAgent(ctx, sqlcdb.UpdateAgentParams{
 			ID:            existing.ID,
 			Name:          req.Name,
@@ -362,7 +379,7 @@ func (h *NodeAgentHandler) RegisterAgent(c *gin.Context) {
 			Capabilities:  rawJSON(req.Capabilities),
 			Resources:     existing.Resources,
 			LastHeartbeat: sql.NullTime{Time: time.Now(), Valid: true},
-			Metadata:      existing.Metadata,
+			Metadata:      rawJSON(metadata),
 		})
 		if err != nil {
 			c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update agent"})
@@ -412,7 +429,7 @@ func (h *NodeAgentHandler) RegisterAgent(c *gin.Context) {
 		Capabilities:  rawJSON(req.Capabilities),
 		Resources:     rawJSON(resources),
 		LastHeartbeat: sql.NullTime{Time: time.Now(), Valid: true},
-		Metadata:      rawJSON(map[string]interface{}{}),
+		Metadata:      rawJSON(metadata),
 	})
 	if err != nil {
 		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create agent"})

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,
   };

docs/api/openapi.yaml

@@ -9130,6 +9130,11 @@ components:
         auth_token:
           type: string
           description: May also be sent via the X-Agent-Token header
+        mesh:
+          type: object
+          additionalProperties:
+            type: 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.
 
     AgentHeartbeat:
       type: object