feat: add proxy and statistics features

server/internal/grpc/registry.go

@@ -22,6 +22,7 @@ type AgentState struct {
 	Volumes    []*agentv1.VolumeInfo
 	Networks   []*agentv1.NetworkInfo
 
+	Stats          *agentv1.StatsSnapshot
 	cmdCh          chan *agentv1.ServerMessage
 	pendingFiles   map[string]chan *agentv1.FileResult
 	pendingUpdates map[string]string // commandID → containerID
@@ -102,6 +103,15 @@ func (r *Registry) UpdateResources(id string, containers []*agentv1.ContainerInf
 	}
 }
 
+func (r *Registry) UpdateStats(id string, stats *agentv1.StatsSnapshot) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if s, ok := r.agents[id]; ok {
+		s.Stats = stats
+		s.LastSeenAt = time.Now()
+	}
+}
+
 // UpdateAlias refreshes the alias for a live agent (called after an admin update).
 func (r *Registry) UpdateAlias(id, alias string) {
 	r.mu.Lock()