refactor(Transport): 优化ConvGenerator类的字段命名和实现

- 将smaller和bigger改为私有只读字段localId和remoteId
- 使用属性替代字段存储Math.Min和Math.Max的结果
- 保持原有的位运算逻辑不变，提高代码可读性

Transport/ConvGenerator.cs

@@ -5,9 +5,10 @@ namespace stick.plugins.kcpable.Protocol;
 
 public class ConvGenerator(CSteamID local, CSteamID remote, int channel)
 {
-    readonly ulong smaller = Math.Min(local.m_SteamID, remote.m_SteamID);
+    private readonly uint localId = local.GetAccountID().m_AccountID;
-    readonly ulong bigger = Math.Max(local.m_SteamID, remote.m_SteamID);
+    private readonly uint remoteId = remote.GetAccountID().m_AccountID;
-    readonly int channel = channel;
+    private uint Smaller => Math.Min(localId, remoteId);
-    private ulong Combined => smaller ^ (bigger << 1) ^ ((ulong)channel << 2); // 位交错
+    private uint Bigger => Math.Max(localId, remoteId);
-    public uint Generate() => (uint)(Combined & 0xFFFFFFFF) ^ (uint)(Combined >> 32); // 全部64位异或压缩到32位的conv
+    private readonly uint channel = (uint)channel;
+    public uint Generate() => Smaller ^ (Bigger << 1) ^ (channel << 2); // 位交错
 }

plan.md

@@ -56,14 +56,13 @@
 
 conv的划分应该精确到单人单channel
 
-1. 取两边steamid
+1. 取两边steamid的accountid
 2. 按大小分成bigger和smaller
 3. 取需要发送到的目标channel（懒得发只定义了两个）
 4. 计算
 
 ``` csharp
-    private ulong Combined => smaller ^ (bigger << 1) ^ ((ulong)channel << 2); // 位交错
+    public uint Generate() => smaller ^ (bigger << 1) ^ (channel << 2); // 位交错
-    public uint Generate() => (uint)(Combined & 0xFFFFFFFF) ^ (uint)(Combined >> 32); // 全部64位异或压缩到32位的conv
 ```
 
 ## 其它