Merge branch 'fix_by_claude' of https://git.tolelom.xyz/A301/a301_mmo_game_server

ClientTester/EchoClientTester/EchoDummyService/DummyClients.cs

@@ -18,6 +18,7 @@ public class DummyClients
     // seq → 송신 타임스탬프 (Stopwatch tick)
     private ConcurrentDictionary<int, long> pendingPings = new();
     private int seqNumber;
+    private const int MaxPendingPings = 1000;
 
     // 유닛 테스트용 (0 = 제한 없음)
     public int TestCount
@@ -117,9 +118,20 @@ public class DummyClients
         int seq = seqNumber++;
         pendingPings[seq] = Stopwatch.GetTimestamp();
 
+        // 응답 없는 오래된 ping 정리 (패킷 유실 시 메모리 누수 방지)
+        if (pendingPings.Count > MaxPendingPings)
+        {
+            int cutoff = seq - MaxPendingPings;
+            foreach (int key in pendingPings.Keys)
+            {
+                if (key < cutoff)
+                    pendingPings.TryRemove(key, out _);
+            }
+        }
+
         PacketHeader packetHeader = new PacketHeader();
         packetHeader.Code = 0;
-        packetHeader.BodyLength = $"seq:{seq}".Length;
+        packetHeader.BodyLength = $"Echo seq:{seq}".Length;
         writer.Put((short)packetHeader.Code);
         writer.Put((short)packetHeader.BodyLength);
         writer.Put($"Echo seq:{seq}");