feat: rewrite PopupHandle for Qt6 with Window popupType support

[18202781743]

1. Rewrite DPopupWindowHandle to work natively with Qt6
2. Support Popup.Window popupType with window decorations (radius,
   border, shadow, blur)
3. Implement screen edge avoidance for popup windows
4. Add close-on-focus-loss behavior through event filters
5. Simplify architecture: remove DPopupWindowHandleImpl and DVtableHook
   usage
6. Remove global PopupMode enum and forceWindowMode property
7. Update DQuickWindowAttached to support QQuickPopup objects

Log: Rewrite PopupHandle to support popupType Window mode in Qt6

Influence:

1. Test Popup with popupType: Window – verify window decorations
   (radius, border, shadow, blur)
2. Test screen edge avoidance: open popups near screen edges and verify
   positioning
3. Test close-on-click-outside: click outside popup and verify it closes
4. Test close-on-focus-loss: switch to other window and verify popup
   closes
5. Test nested popups (submenus) – verify correct screen assignment and
   flipping behavior
6. Test window properties: windowRadius, borderWidth, borderColor,
   shadowRadius, shadowOffset, shadowColor
7. Test translucentBackground and enableBlurWindow properties
8. Test menu popup behavior – ensure no regressions in Menu popup
9. Test with different screen configurations (multiple monitors,
   different DPI)
10. Verify no crash when popup is destroyed

feat: 重写PopupHandle以支持Qt6的Window模式

1. 重写DPopupWindowHandle以原生支持Qt6
2. 支持Popup.Window弹窗类型，添加窗口装饰（圆角、边框、阴影、模糊）
3. 实现弹窗窗口的屏幕边缘避让
4. 通过事件过滤器实现失去焦点自动关闭
5. 简化架构：移除DPopupWindowHandleImpl和DVtableHook的使用
6. 移除全局PopupMode枚举和forceWindowMode属性
7. 更新DQuickWindowAttached以支持QQuickPopup对象

Log: 重写PopupHandle支持popupType为Window模式

Influence:

1. 测试Popup的popupType: Window模式 – 验证窗口装饰（圆角、边框、阴影、
   模糊）
2. 测试屏幕边缘避让：在屏幕边缘打开弹窗，验证位置调整
3. 测试点击外部关闭：点击弹窗外区域，验证弹窗关闭
4. 测试失去焦点关闭：切换到其他窗口，验证弹窗关闭
5. 测试嵌套弹窗（子菜单）– 验证正确的屏幕分配和翻转行为
6. 测试窗口属性：windowRadius、borderWidth、borderColor、shadowRadius、
   shadowOffset、shadowColor
7. 测试translucentBackground和enableBlurWindow属性
8. 测试菜单弹窗行为 – 确保菜单弹窗没有回归问题
9. 测试不同屏幕配置（多显示器、不同DPI）
10. 验证弹窗销毁时不会崩溃

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