Add FanControl.ChromeboxEC plugin, project background, ectool docs

- Add FanControl.ChromeboxEC plugin for Fan Control
- Add project background/缘由 in README (EN/zh)
- Add docs/ectool-commands-zh.md
- Update sln, appsettings, gitignore

Made-with: Cursor

FanControl.ChromeboxEC/ChromeboxECTempSensor.cs

@@ -0,0 +1,27 @@
+using FanControl.Plugins;
+
+namespace FanControl.ChromeboxEC;
+
+/// <summary>温度：ectool temps &lt;sensorid&gt;</summary>
+public sealed class ChromeboxECTempSensor : IPluginSensor
+{
+    private readonly string _ectoolPath;
+    private readonly string[] _tempArgs;
+
+    public ChromeboxECTempSensor(string ectoolPath, string[] tempArgs)
+    {
+        _ectoolPath = ectoolPath;
+        _tempArgs = tempArgs;
+    }
+
+    public string Id => "ChromeboxEC_Temp";
+    public string Name => "Chromebox EC Temperature";
+    public string Origin => "ectool temps";
+    public float? Value { get; private set; }
+
+    public void Update()
+    {
+        var (ok, stdout, _) = EctoolRunner.Run(_ectoolPath, _tempArgs);
+        Value = ok && EctoolRunner.TryParseTemp(stdout) is { } temp ? temp : null;
+    }
+}