[GFX-305] fix(connection): 统一 PipeConnectionBase 协议错误处 CloseReason 命名空间限定

[AlianBlank]

关联

Linear: GFX-305

背景

issue 引用的三个上游 commit（c21bccfe / a26052c / 81d8e2e）对 PipeConnectionBase.cs 的功能性修复（consumed 赋值、服务端关闭流程、long Consumed / GetPosition / needReadMore）已在 main 存在 —— 该仓在 2025-04-21 通过 6dad878d（同步上游 f68fe7960）引入，当前代码与上游 kerryjiang/SuperSocket master 在该文件功能逻辑上一致。reader.AdvanceTo(consumed, buffer.End) 双参写法是比 81d8e2e（单参）更新的上游行为，避免了单参在不完整分包场景下的忙循环，当前代码正确。

本次改动

统一 src/GameFrameX.SuperSocket.Connection/PipeConnectionBase.cs:418 协议错误分支的 CloseReason 命名空间限定：

• SuperSocket.Connection.CloseReason.ProtocolError → Connection.CloseReason.ProtocolError

与同项目兄弟文件（PipeConnection.cs:117/142、ConnectionBase.cs:106 统一用 Connection.CloseReason.X）保持一致，消除对 C# 命名空间向上隐式查找的依赖。两者解析为同一类型 GameFrameX.SuperSocket.Connection.CloseReason，无行为变化。

验证

dotnet build GameFrameX.SuperSocket.sln → 0 Error（227 既有 warning，与改动无关）。

[linear-code]

GFX-305

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Reviewing files that changed from the base of the PR and between 92f2265 and 0bc82b9.

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• src/GameFrameX.SuperSocket.Connection/PipeConnectionBase.cs

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