Add mcp dns and mcp node routes commands

mcp dns queries MCNS via an agent to list all zones and DNS records.
mcp node routes queries mc-proxy on each node for listener/route status,
matching the mcproxyctl status output format.

New agent RPCs: ListDNSRecords, ListProxyRoutes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

internal/agent/proxy_rpc.go

@@ -0,0 +1,46 @@
+package agent
+
+import (
+	"context"
+	"fmt"
+
+	mcpv1 "git.wntrmute.dev/mc/mcp/gen/mcp/v1"
+	"google.golang.org/protobuf/types/known/timestamppb"
+)
+
+// ListProxyRoutes queries mc-proxy for its current status and routes.
+func (a *Agent) ListProxyRoutes(ctx context.Context, _ *mcpv1.ListProxyRoutesRequest) (*mcpv1.ListProxyRoutesResponse, error) {
+	a.Logger.Debug("ListProxyRoutes called")
+
+	status, err := a.Proxy.GetStatus(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("get mc-proxy status: %w", err)
+	}
+
+	resp := &mcpv1.ListProxyRoutesResponse{
+		Version:          status.Version,
+		TotalConnections: status.TotalConnections,
+	}
+	if !status.StartedAt.IsZero() {
+		resp.StartedAt = timestamppb.New(status.StartedAt)
+	}
+
+	for _, ls := range status.Listeners {
+		listener := &mcpv1.ProxyListenerInfo{
+			Addr:              ls.Addr,
+			RouteCount:        int32(ls.RouteCount), //nolint:gosec // bounded
+			ActiveConnections: ls.ActiveConnections,
+		}
+		for _, r := range ls.Routes {
+			listener.Routes = append(listener.Routes, &mcpv1.ProxyRouteInfo{
+				Hostname:   r.Hostname,
+				Backend:    r.Backend,
+				Mode:       r.Mode,
+				BackendTls: r.BackendTLS,
+			})
+		}
+		resp.Listeners = append(resp.Listeners, listener)
+	}
+
+	return resp, nil
+}