feat(cluster): use node/discovered event to update memberlist

docs/Architecture.md

@@ -140,7 +140,7 @@ The `NodeContext` provides an event-driven architecture for system-wide communic
 
 ```cpp
 // Subscribe to events
-ctx.on("node_discovered", [](void* data) {
+ctx.on("node/discovered", [](void* data) {
     NodeInfo* node = static_cast<NodeInfo*>(data);
     // Handle new node discovery
 });
@@ -154,13 +154,13 @@ ctx.on("cluster_updated", [](void* data) {
 
 ```cpp
 // Publish events
-ctx.fire("node_discovered", &newNode);
+ctx.fire("node/discovered", &newNode);
 ctx.fire("cluster_updated", &clusterData);
 ```
 
 ### Available Events
 
-- **`node_discovered`**: New node added or local node refreshed
+- **`node/discovered`**: New node added or local node refreshed
 
 ## Resource Monitoring