feat: memberlist is now a map

src/ClusterManager.h

@@ -6,6 +6,7 @@
 #include <ESP8266WiFi.h>
 #include <ArduinoJson.h>
 #include <ESP8266HTTPClient.h>
+#include <map>
 
 class ClusterManager {
 public:
@@ -16,7 +17,7 @@ public:
     void updateAllNodeStatuses();
     void removeDeadNodes();
     void printMemberList();
-    const std::vector<NodeInfo>& getMemberList() const { return *ctx.memberList; }
+    const std::map<String, NodeInfo>& getMemberList() const { return *ctx.memberList; }
     void fetchNodeInfo(const IPAddress& ip);
     void updateLocalNodeResources();
     void heartbeatTaskCallback();