💾 Feat(Contract): IPluginServer 接口新增 Connections 属性

- 新增 IReadOnlyList<IPluginConnector> Connections { get; }
- 允许 UI 层通过 DI 接口访问已连接插件的 PluginInfo.Functions

Author: StardustSeemsInk

KitX Core Contracts/KitX.Core.Contract/Plugin/IPluginService.cs

@@ -77,6 +77,11 @@ public interface IPluginServer
     /// </summary>
     int? Port { get; }
 
+    /// <summary>
+    /// Gets the list of currently connected plugins
+    /// </summary>
+    IReadOnlyList<IPluginConnector> Connections { get; }
+
     /// <summary>
     /// Starts the plugin server
     /// </summary>