[新增] Modbus TCP Master Connector + WebUI 卡片化 + Unobserved Task 修正

主要功能：
- 新增 Modbus TCP Master port 類型 — 內建 FluentModbus polling，
  支援 FC 01/02/03/04，dataType bit/bits/uint16/int16/uint32/int32/float32，
  scale + offset，自動重連節流，連線失敗逐步退避。
- PortData 加 ModbusConfig + ModbusRegisterMap，向後相容（nullable）。
- NetworkMessageRouter 加 InjectSynthesizedMessageAsync — 讓 Modbus poller
  把組好的 id:X;reg:N 訊息餵進既有 mask + forward pipeline。
- WebUI Port 管理頁從 table 改成 card grid，含協定 badge、連線細條、
  Mask tag、metadata icon 區、stats、device IDs 摘要、icon-only 操作按鈕。
- WebUI 表單加 Modbus 設定區（Slave ID / Polling 間隔 / Device ID /
  Registers JSON），3 語系補上 selectAll / totalPort / sourceLabel key。
- Polling 重撈 (3 秒一次) 不再清除使用者勾選 — 重 render 前保留 checked
  狀態，render 後恢復。
- 4 處 fire-and-forget task 補上 ContinueWith — 不再噴 Critical
  Unobserved Task exception (TCPServer NotifyAsync、UDP SweepStaleDevices、
  UDP SendAsync forward)。

工具：
- modbus_slave_sim.py — pymodbus 迷你 slave 模擬器，無需安裝 runtime，
  自動產生 GrayCode + sine wave 測試資料。

Author: changlin.cai

SDK/Arduino/EdgeLink/examples/tcp_sensor/tcp_sensor.ino

@@ -11,7 +11,7 @@
  */
 
 #include <WiFi.h>
-#include <EdgeLink.h>
+#include <EdgeLinkTCP.h>
 
 // ── 設定 ──────────────────────────────────
 const char* WIFI_SSID     = "your-ssid";

Server/EdgeLinkServer.csproj

@@ -17,6 +17,7 @@
     <PackageReference Include="Microsoft.Extensions.Hosting.WindowsServices" Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging"             Version="8.0.0" />
     <PackageReference Include="Microsoft.Extensions.Logging.Console"     Version="8.0.0" />
+    <PackageReference Include="FluentModbus"                             Version="5.3.0" />
   </ItemGroup>
 
   <ItemGroup>

Server/NetworkServer/Base/Models/PortData.cs

@@ -29,6 +29,7 @@ public class PortData
     public string RequestMode = "";
     public string SourceProtocolName = "";
     public string SourceProtocolId = "";
+    public ModbusConfig? Modbus;
 
     [JsonIgnore] public int CurrentConnections;
     [JsonIgnore] public int TotalConnections;
@@ -42,3 +43,27 @@ public class PortDetails
     public string Port = "";
     public string Description = "";
 }
+
+// Modbus TCP Master polling 配置
+[Serializable]
+public class ModbusConfig
+{
+    public int SlaveId = 1;
+    public int PollIntervalMs = 100;       // 10 Hz default
+    public int ConnectTimeoutMs = 1000;
+    public int ReadTimeoutMs = 1000;
+    public string DeviceId = "";           // 變成 id:xxx 欄位的值
+    public List<ModbusRegisterMap> Registers = new();
+}
+
+[Serializable]
+public class ModbusRegisterMap
+{
+    public string Name = "";               // 欄位名 (yaw, pitch, jx, jy ...)
+    public int FunctionCode = 3;           // 1=Coil, 2=DI, 3=Holding, 4=Input
+    public int StartAddress;
+    public int Quantity = 1;
+    public string DataType = "uint16";     // bit | uint16 | int16 | uint32 | int32 | float32 | bits-int (GrayCode 8-16 bits 組合)
+    public double Scale = 1.0;
+    public double Offset;
+}

Server/NetworkServer/Connector/NetworkConnectorCore.cs

@@ -1,6 +1,7 @@
 using EdgeLink.NetworkServer.Base;
 using EdgeLink.NetworkServer.Base.Models;
 using EdgeLink.NetworkServer.Logging;
+using EdgeLink.NetworkServer.Modbus;
 using EdgeLink.NetworkServer.TCP;
 using EdgeLink.NetworkServer.Udp;
 
@@ -18,9 +19,10 @@ public NetworkConnectorCore(IMainThreadDispatcher? dispatcher = null)
         _udpConnector       = new UdpConnector(dispatcher);
         _connectors = new Dictionary<string, NetworkConnectorBase>
         {
-            { "UDP",        _udpConnector },
-            { "TCP SERVER", _tcpServerConnector },
-            { "TCP CLIENT", new TCPClientConnector(dispatcher) }
+            { "UDP",                _udpConnector },
+            { "TCP SERVER",         _tcpServerConnector },
+            { "TCP CLIENT",         new TCPClientConnector(dispatcher) },
+            { "MODBUS TCP MASTER",  new ModbusTcpMasterConnector() }
         };
     }