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/ChromeboxECControlSensor.cs

@@ -0,0 +1,41 @@
+using FanControl.Plugins;
+
+namespace FanControl.ChromeboxEC;
+
+/// <summary>风扇控制：ectool fanduty &lt;percent&gt;</summary>
+public sealed class ChromeboxECControlSensor : IPluginControlSensor2
+{
+    private readonly string _ectoolPath;
+    private readonly string[] _autoFanArgs;
+    private float? _value;
+
+    public ChromeboxECControlSensor(string ectoolPath, string[] autoFanArgs)
+    {
+        _ectoolPath = ectoolPath;
+        _autoFanArgs = autoFanArgs;
+    }
+
+    public string Id => "ChromeboxEC_Control";
+    public string Name => "Chromebox EC Fan";
+    public string Origin => "ectool fanduty";
+    public float? Value => _value;
+    public string? PairedFanSensorId => "ChromeboxEC_Fan";
+
+    /// <summary>设置风扇占空比 0–100，调用 ectool fanduty</summary>
+    public void Set(float val)
+    {
+        _value = val;
+        var duty = (int)Math.Clamp(Math.Round(val), 0, 100);
+        EctoolRunner.Run(_ectoolPath, ["fanduty", duty.ToString()]);
+    }
+
+    /// <summary>禁用控制时恢复 EC 自动风扇，调用 ectool autofanctrl</summary>
+    public void Reset()
+    {
+        _value = null;
+        if (_autoFanArgs is { Length: > 0 })
+            EctoolRunner.Run(_ectoolPath, _autoFanArgs);
+    }
+
+    public void Update() { }
+}