feat: Add Win32 platform window interface support

[kt286]

• Add DWin32PlatformWindowInterface class implementation
• Support Windows 10/11 window effects (rounded corners, shadows, transparency)
• Integrate DWM API for immersive dark mode
• Add Win32 CMake build configuration

feat: 添加 Win32 平台窗口接口支持

• 新增 DWin32PlatformWindowInterface 类实现
• 支持 Windows 10/11 的窗口效果（圆角、阴影、透明等）
• 集成 DWM API 实现沉浸式深色模式
• 添加 Win32 CMake 构建配置

Summary by Sourcery

Add a Win32 platform window interface and wire it into the platform handle to support native Windows window effects and theming.

New Features:

• Introduce DWin32PlatformWindowInterface to provide platform-specific window controls and effects on Windows.
• Enable Win32 builds by adding a Win32 plugins CMake configuration and linking against the DWM API.

Enhancements:

• Detect Windows light/dark theme from the registry in DGuiApplicationHelper to select the appropriate palette.

Build:

• Include Win32 platform plugin sources in the main library build when targeting Windows and link against dwmapi.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kt286

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[sourcery-ai]

Reviewer's Guide

This PR adds a Win32-specific platform window interface and build integration, enabling Windows 10/11 visual effects (rounded corners, blur/transparency, frameless windows) and immersive dark mode, and wires it into the existing platform abstraction and palette handling.

Sequence diagram for Win32 window show and dark mode application

sequenceDiagram
    participant QWindow
    participant DWin32PlatformWindowInterface as Win32Interface
    participant WindowsRegistry
    participant DwmApi

    QWindow->>Win32Interface: eventFilter(QEvent::Show)
    Win32Interface->>Win32Interface: setEnabledNoTitlebar(m_enabled)
    Win32Interface->>Win32Interface: updateShadow()
    Win32Interface->>Win32Interface: updateRoundedCorners()
    Win32Interface->>Win32Interface: updateSystemTheme()
    Win32Interface->>WindowsRegistry: RegOpenKeyExW(Personalize)
    WindowsRegistry-->>Win32Interface: AppsUseLightTheme value
    Win32Interface->>DwmApi: DwmSetWindowAttribute(DWMWA_USE_IMMERSIVE_DARK_MODE)
    Win32Interface->>Win32Interface: updateTranslucentBackground()
    Win32Interface->>Win32Interface: updateBlurWindow()

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File-Level Changes

Change	Details	Files
Introduce a Win32 platform window interface implementation that maps DPlatformWindowInterface APIs to Win32/DWM behavior.	Add DWin32PlatformWindowInterface class deriving from DPlatformWindowInterface and QObject Implement window styling toggles for frameless mode, system resize/move, and cursor override flags using Win32 window styles Implement radius, border, shadow, clip path, frame mask, translucent background, blur, and startup/effect properties with DWM and GDI regions Add eventFilter-based mouse handling to trigger startSystemMove from a custom titlebar area Add helper functions for HWND retrieval and runtime OS version checks for Windows 10/11 feature availability Implement system theme detection and immersive dark mode via registry and DwmSetWindowAttribute	src/plugins/platform/win32/dwin32platformwindowinterface.h src/plugins/platform/win32/dwin32platformwindowinterface.cpp
Wire the Win32 window interface into the platform handle factory so Windows builds use the new implementation.	Include dwin32platformwindowinterface header conditionally on Q_OS_WIN Instantiate DWin32PlatformWindowInterface in createWindowInterface when running on Windows	src/kernel/dplatformhandle.cpp
Add Win32-specific build configuration and linkage for the new plugin and DWM API.	Introduce win32.cmake that glob-collects Win32 plugin headers/sources into win32_SRC Include win32.cmake and add win32_SRC to target_sources when WIN32 is true Link dwmapi library on Windows	src/plugins/plugins.cmake src/plugins/platform/win32/win32.cmake
Adjust palette/theme detection on Windows to derive dark/light mode from system settings instead of theme names.	Add Q_OS_WIN branch in fetchPalette to read AppsUseLightTheme from the Windows registry Set palette type to DarkType or LightType based on registry value and skip theme->fetchPalette path on Windows	src/kernel/dguiapplicationhelper.cpp
Update SPDX copyright metadata to cover the new years and Win32 implementation.	Extend dplatformhandle copyright range to 2022–2026 Add copyright/license headers to Win32 interface files	src/kernel/dplatformhandle.cpp src/plugins/platform/win32/dwin32platformwindowinterface.h src/plugins/platform/win32/dwin32platformwindowinterface.cpp

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