port(2V0-b): EterPythonLib 窗口树实现 + EterLib 资源层

- port: PythonWindow/PythonSlotWindow/PythonGridSlotWindow/PythonWindowManager(布局/命中/事件/插槽渲染)
- port: EterLib ReferenceObject/Resource/ResourceManager(资源引用与查找)
- platform: EterLib Util、EterPythonLib PythonGraphic
- tests: port.window_tree(需要解释器,不需要 40250 Client/pack)
- 顺带补上 4 个缺失的 Godot .uid

Co-Authored-By: Claude Code <noreply@anthropic.com>

extension/src/port/EterLib/ReferenceObject.cpp

@@ -0,0 +1,61 @@
+#include "StdAfx.h"
+#include "ReferenceObject.h"
+
+CReferenceObject::CReferenceObject() : m_refCount(0), m_destructed(false)
+{
+}
+
+CReferenceObject::~CReferenceObject()
+{
+}
+
+void CReferenceObject::AddReference()
+{
+	if (m_refCount == 0)
+		OnConstruct();
+	
+	++m_refCount;
+}
+
+int CReferenceObject::GetReferenceCount()
+{
+	return m_refCount;
+}
+
+void CReferenceObject::AddReferenceOnly()
+{
+	++m_refCount;
+}
+
+void CReferenceObject::Release()
+{
+	if (m_refCount > 1)
+	{
+		--m_refCount;
+		return;
+	}
+
+	assert(m_destructed == false);
+	assert(m_refCount >= 0);
+	m_refCount = 0;
+	OnSelfDestruct();
+}
+
+void CReferenceObject::OnConstruct()
+{
+	m_destructed = false;
+}
+
+void CReferenceObject::OnSelfDestruct()
+{
+	m_destructed = true;
+	delete this;
+}
+
+bool CReferenceObject::canDestroy()
+{
+	if (m_refCount > 0)
+		return false;
+
+	return true;
+}