fix(game-server): don't crash on malformed bunch channel index

Log + drop the packet (with net version) instead of throwing, so a
bit-alignment/version mismatch with the client doesn't kill the server.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Prospect.Unreal/Net/UNetConnection.cs

@@ -666,7 +666,10 @@ public abstract class UNetConnection : UPlayer
 
                     if (bunch.ChIndex >= MaxChannelSize)
                     {
-                        throw new Exception("Bunch channel index exceeds channel limit");
+                        // Don't crash the whole server on a malformed/misaligned bunch (e.g. a
+                        // version/bit-alignment mismatch with the client). Log and drop the packet.
+                        Logger.Error("[HS-SEQ] Bunch channel index {Idx} exceeds limit {Max} (netVer={Ver}) — dropping packet", bunch.ChIndex, MaxChannelSize, (int)bunch.EngineNetVer());
+                        return;
                     }
                 }