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>

proto/mcp/v1/mcp.proto

@@ -34,6 +34,12 @@ service McpAgentService {
   // Node
   rpc NodeStatus(NodeStatusRequest) returns (NodeStatusResponse);
 
+  // DNS (query MCNS)
+  rpc ListDNSRecords(ListDNSRecordsRequest) returns (ListDNSRecordsResponse);
+
+  // Proxy routes (query mc-proxy)
+  rpc ListProxyRoutes(ListProxyRoutesRequest) returns (ListProxyRoutesResponse);
+
   // Logs
   rpc Logs(LogsRequest) returns (stream LogsResponse);
 }
@@ -301,3 +307,49 @@ message LogsRequest {
 message LogsResponse {
   bytes data = 1;
 }
+
+// --- DNS ---
+
+message ListDNSRecordsRequest {}
+
+message DNSZone {
+  string name = 1;
+  repeated DNSRecord records = 2;
+}
+
+message DNSRecord {
+  int64 id = 1;
+  string name = 2;
+  string type = 3;
+  string value = 4;
+  int32 ttl = 5;
+}
+
+message ListDNSRecordsResponse {
+  repeated DNSZone zones = 1;
+}
+
+// --- Proxy routes ---
+
+message ListProxyRoutesRequest {}
+
+message ProxyRouteInfo {
+  string hostname = 1;
+  string backend = 2;
+  string mode = 3;
+  bool backend_tls = 4;
+}
+
+message ProxyListenerInfo {
+  string addr = 1;
+  int32 route_count = 2;
+  int64 active_connections = 3;
+  repeated ProxyRouteInfo routes = 4;
+}
+
+message ListProxyRoutesResponse {
+  string version = 1;
+  int64 total_connections = 2;
+  google.protobuf.Timestamp started_at = 3;
+  repeated ProxyListenerInfo listeners = 4;
+}