refactor(signal): 将SignalBuilder的参数类型从Node改为GodotObject

- 修改SignalBuilder构造函数参数类型从Node为GodotObject
- 修改SignalBuilder.End()方法返回类型从Node为GodotObject
- 修改SignalFluentExtensions.Signal扩展方法参数名和类型从Node为GodotObject
- 更新XML文档注释中的参数描述

GFramework.Godot/extensions/signal/SignalBuilder.cs

@@ -7,7 +7,7 @@ namespace GFramework.Godot.extensions.signal;
 /// </summary>
 /// <param name="target">要连接信号的目标节点</param>
 /// <param name="signal">要连接的信号名称</param>
-public sealed class SignalBuilder(Node target, StringName signal)
+public sealed class SignalBuilder(GodotObject target, StringName signal)
 {
     private GodotObject.ConnectFlags? _flags;
 
@@ -42,5 +42,5 @@ public sealed class SignalBuilder(Node target, StringName signal)
     /// 显式结束，返回 Node
     /// </summary>
     /// <returns>目标节点</returns>
-    public Node End() => target;
+    public GodotObject End() => target;
 }

GFramework.Godot/extensions/signal/SignalFluentExtensions.cs

@@ -10,11 +10,11 @@ public static class SignalFluentExtensions
     /// <summary>
     /// 为指定节点创建信号构建器
     /// </summary>
-    /// <param name="node">要创建信号的节点</param>
+    /// <param name="object">要创建信号构建器的Godot对象</param>
     /// <param name="signal">信号名称</param>
     /// <returns>信号构建器实例</returns>
     public static SignalBuilder Signal(
-        this Node node,
+        this GodotObject @object,
         StringName signal)
-        => new(node, signal);
+        => new(@object, signal);
 }