从Serein.Library分离了WebSocket/Modbus；新增了Json门户类，用于未来的Http、WebSocket、Mqtt、gRPC、QUIC扩展。

Serein.Proto.Modbus/IModbusClient.cs

@@ -0,0 +1,58 @@
+namespace Serein.Proto.Modbus
+{
+    /// <summary>
+    /// Modbus 客户端通用接口 (TCP/RTU 通用)
+    /// </summary>
+    public interface IModbusClient : IDisposable
+    {
+        /// <summary>
+        /// 报文发送时
+        /// </summary>
+        Action<byte[]> OnTx { get; set; }
+
+        /// <summary>
+        /// 接收到报文时
+        /// </summary>
+        Action<byte[]> OnRx { get; set; }
+
+        /// <summary>
+        /// 读取线圈状态 (0x01)
+        /// </summary>
+        Task<bool[]> ReadCoils(ushort startAddress, ushort quantity);
+
+        /// <summary>
+        /// 读取离散输入状态 (0x02)
+        /// </summary>
+        Task<bool[]> ReadDiscreteInputs(ushort startAddress, ushort quantity);
+
+        /// <summary>
+        /// 读取保持寄存器 (0x03)
+        /// </summary>
+        Task<ushort[]> ReadHoldingRegisters(ushort startAddress, ushort quantity);
+
+        /// <summary>
+        /// 读取输入寄存器 (0x04)
+        /// </summary>
+        Task<ushort[]> ReadInputRegisters(ushort startAddress, ushort quantity);
+
+        /// <summary>
+        /// 写单个线圈 (0x05)
+        /// </summary>
+        Task WriteSingleCoil(ushort address, bool value);
+
+        /// <summary>
+        /// 写单个寄存器 (0x06)
+        /// </summary>
+        Task WriteSingleRegister(ushort address, ushort value);
+
+        /// <summary>
+        /// 写多个线圈 (0x0F)
+        /// </summary>
+        Task WriteMultipleCoils(ushort startAddress, bool[] values);
+
+        /// <summary>
+        /// 写多个寄存器 (0x10)
+        /// </summary>
+        Task WriteMultipleRegisters(ushort startAddress, ushort[] values);
+    }
+}