feat(UI): 向IUIGroupHelper接口添加Depth属性并修改Handler方法签名

为IUIGroupHelper接口和UIGroupHelperBase基类添加Depth属性，用于获取界面组深度。
同时修改Handler方法的签名，增加depth参数并设置默认值，以支持在创建界面组辅助器时传入初始深度。

Author: AlianBlank

Runtime/UI/IUIGroupHelper.cs

@@ -38,6 +38,11 @@ namespace GameFrameX.UI.Runtime
     /// </summary>
     public interface IUIGroupHelper
     {
+        /// <summary>
+        /// 获取界面组深度。
+        /// </summary>
+        int Depth { get; }
+
         /// <summary>
         /// 设置界面组深度。
         /// </summary>
@@ -51,6 +56,8 @@ public interface IUIGroupHelper
         /// <param name="groupName">界面组名称。</param>
         /// <param name="uiGroupHelperTypeName">界面组辅助器类型名。</param>
         /// <param name="customUIGroupHelper">自定义的界面组辅助器.</param>
-        IUIGroupHelper Handler(Transform root, string groupName, string uiGroupHelperTypeName, IUIGroupHelper customUIGroupHelper);
+        /// <param name="depth">界面组深度。</param>
+        /// <returns>界面组辅助器。</returns>
+        IUIGroupHelper Handler(Transform root, string groupName, string uiGroupHelperTypeName, IUIGroupHelper customUIGroupHelper, int depth = 0);
     }
 }

Runtime/UIComponent.IUIGroup.cs

@@ -98,9 +98,9 @@ public bool AddUIGroup(string uiGroupName, int depth)
             }
 
 #if ENABLE_UI_FAIRYGUI
-            UIGroupHelperBase uiGroupHelper = (UIGroupHelperBase)m_CustomUIGroupHelper.Handler(m_InstanceFairyGUIRoot, uiGroupName, m_UIGroupHelperTypeName, m_CustomUIGroupHelper);
+            UIGroupHelperBase uiGroupHelper = (UIGroupHelperBase)m_CustomUIGroupHelper.Handler(m_InstanceFairyGUIRoot, uiGroupName, m_UIGroupHelperTypeName, m_CustomUIGroupHelper, depth);
 #else
-            UIGroupHelperBase uiGroupHelper = (UIGroupHelperBase)m_CustomUIGroupHelper.Handler(m_InstanceUGUIRoot, uiGroupName, m_UIGroupHelperTypeName, m_CustomUIGroupHelper);
+            UIGroupHelperBase uiGroupHelper = (UIGroupHelperBase)m_CustomUIGroupHelper.Handler(m_InstanceUGUIRoot, uiGroupName, m_UIGroupHelperTypeName, m_CustomUIGroupHelper, depth);
 #endif
             if (uiGroupHelper == null)
             {

Runtime/UIGroupHelperBase.cs

@@ -39,6 +39,11 @@ namespace GameFrameX.UI.Runtime
     [UnityEngine.Scripting.Preserve]
     public abstract class UIGroupHelperBase : MonoBehaviour, IUIGroupHelper
     {
+        /// <summary>
+        /// 获取界面组深度。
+        /// </summary>
+        public abstract int Depth { get; protected set; }
+
         /// <summary>
         /// 设置界面组深度。
         /// </summary>
@@ -52,6 +57,7 @@ public abstract class UIGroupHelperBase : MonoBehaviour, IUIGroupHelper
         /// <param name="groupName">界面组名称。</param>
         /// <param name="uiGroupHelperTypeName">界面组辅助器类型名。</param>
         /// <param name="customUIGroupHelper">自定义的界面组辅助器.</param>
-        public abstract IUIGroupHelper Handler(Transform root, string groupName, string uiGroupHelperTypeName, IUIGroupHelper customUIGroupHelper);
+        /// <param name="depth">界面组深度。</param>
+        public abstract IUIGroupHelper Handler(Transform root, string groupName, string uiGroupHelperTypeName, IUIGroupHelper customUIGroupHelper, int depth = 0);
     }
 }