feat: add dbus and remove xkbcommon

[litwak913]

增加了 DBus 构建，从最新的 vcpkg 上拉了些补丁，同时移除暂时没用的 xkbcommon

Summary by Sourcery

新特性：

• 通过 vcpkg overlay 引入 DBus 端口，包括对可选的 systemd 和 X11 功能及相关工具的支持。

Original summary in English

Summary by Sourcery

New Features:

• Introduce a DBus port via vcpkg overlay, including support for optional systemd and X11 features and associated tools.

[sourcery-ai]

嗨，我留下了一些整体性的反馈：

• 在 file(REMOVE_RECURSE ...) 代码块中，"${CURRENT_PACKAGES_DIR}/share/dbus-1/system.conf" 出现了两次；为提高可读性，建议去掉重复的条目。
• 在发布配置中，你目前设置的是 DBUS_DISABLE_ASSERT=OFF；如果这是刻意为之，那没有问题，但否则建议在发布构建中启用断言禁用，以符合常见的性能预期。

给 AI 代理的提示

请根据本次代码审查中的评论进行修改：

## 整体评论
- 在 `file(REMOVE_RECURSE ...)` 代码块中，`"${CURRENT_PACKAGES_DIR}/share/dbus-1/system.conf"` 出现了两次；为提高可读性，建议去掉重复的条目。
- 在发布配置中，你目前设置的是 `DBUS_DISABLE_ASSERT=OFF`；如果这是刻意为之，那没有问题，但否则建议在发布构建中启用断言禁用，以符合常见的性能预期。

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Original comment in English

Hey - I've left some high level feedback:

• In the file(REMOVE_RECURSE ...) block, "${CURRENT_PACKAGES_DIR}/share/dbus-1/system.conf" appears twice; consider removing the duplicate entry for clarity.
• For the release configuration, you currently set DBUS_DISABLE_ASSERT=OFF; if this is intentional it's fine, but otherwise consider enabling assertion disabling in release builds to match typical performance expectations.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In the `file(REMOVE_RECURSE ...)` block, `"${CURRENT_PACKAGES_DIR}/share/dbus-1/system.conf"` appears twice; consider removing the duplicate entry for clarity.
- For the release configuration, you currently set `DBUS_DISABLE_ASSERT=OFF`; if this is intentional it's fine, but otherwise consider enabling assertion disabling in release builds to match typical performance expectations.

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