feat: adapt keyboard layout for Treeland

[mhduiy]

Treeland 键盘布局适配

适配 Treeland 环境下的键盘布局设置，通过 dconfig 写入 treeland user seat 的 xkbLayout/xkbVariant 配置，X11 路径保留不变。

改动内容

• 新增 treeland user seat DConfig 常量（treelandAppID/treelandSeatName/treelandKeyXkbLayout/treelandKeyXkbVariant）
• Keyboard 结构体新增 treelandSeatConfig 字段，newKeyboard 中 hasTreeLand 分支初始化
• applyLayout() 方法新增 hasTreeLand 分流，调用 applyLayoutTreeLand
• 新增 applyLayoutTreeLand 方法：通过 dconfig 写入 xkbLayout/xkbVariant，复用 layout/variant 拆分与 ,us 兜底逻辑
• applyOptions() 添加 hasTreeLand guard，避免 treeland 下执行 setxkbmap 产生噪音日志

验证

• 编译验证通过（dde-daemon 6.1.106 amd64）
• 单测通过
• X11 路径不受影响

参考上游 treeland PR: linuxdeepin/treeland#1406

Multica Issue: DDE-321

Summary by Sourcery

Adapt keyboard layout handling to configure Treeland user seats without affecting X11 behavior.

New Features:

• Support applying keyboard layouts and variants through Treeland user-seat configuration.

Enhancements:

• Preserve the existing X11 keyboard layout path while bypassing X11 option application in Treeland environments.

[deepin-ci-robot]

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[sourcery-ai]

Reviewer's Guide

The PR adapts keyboard layout updates for Treeland by initializing a user-seat DConfig client and writing xkbLayout/xkbVariant values, while preserving the existing X11 behavior and avoiding unsupported setxkbmap option calls in Treeland.

Sequence diagram for Treeland keyboard layout application

sequenceDiagram
    participant Keyboard
    participant TreelandSeatConfig as TreelandUserSeatDConfig

    Keyboard->>Keyboard: applyLayout()
    alt hasTreeLand
        Keyboard->>Keyboard: applyLayoutTreeLand(value)
        Keyboard->>TreelandSeatConfig: SetValue(xkbLayout, layout)
        Keyboard->>TreelandSeatConfig: SetValue(xkbVariant, variant)
    else X11
        Keyboard->>Keyboard: applyLayout(value)
    end

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Flow diagram for Treeland keyboard initialization and options handling

flowchart TD
    Start[newKeyboard]
    Environment{hasTreeLand}
    X11[Initialize X connection]
    Treeland[NewDConfig treeland user seat]
    Layout[applyLayout]
    Options[applyOptions]
    Skip[Skip setxkbmap options]

    Start --> Environment
    Environment -->|false| X11
    Environment -->|true| Treeland
    X11 --> Layout
    Treeland --> Layout
    Layout --> Options
    Options -->|hasTreeLand| Skip
    Options -->|X11| SetOptions[Apply setxkbmap options]

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File-Level Changes

Change	Details	Files
Add Treeland user-seat DConfig support for applying keyboard layouts and variants.	Define Treeland app, seat, and xkb configuration keys. Initialize a Treeland seat DConfig client when running outside the X11 path. Split layout and variant values, preserve the existing fallback to a US layout, and write them to DConfig with nil/error handling.	inputdevices1/keyboard.go
Route keyboard application behavior according to the active display environment.	Dispatch layout updates to the Treeland DConfig implementation when Treeland is detected. Skip X11-only keyboard option application under Treeland. Keep the existing setxkbmap layout and option paths unchanged for X11.	inputdevices1/keyboard.go

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="inputdevices1/keyboard.go" line_range="305-308" />
<code_context>
 	currentLayout := kbd.CurrentLayout.Get()
 	kbd.PropsMu.RUnlock()

+	if hasTreeLand {
+		kbd.applyLayoutTreeLand(currentLayout)
+		return
+	}
+
 	err := applyLayout(currentLayout)
</code_context>
<issue_to_address>
**issue (broader_impact):** Every Wayland session is treated as Treeland because `hasTreeLand` is set solely from `XDG_SESSION_TYPE=wayland`; on a non-Treeland Wayland compositor, `applyLayoutTreeLand` tries to write the Treeland DConfig instead of applying the layout, so layout changes are ignored when that manager is unavailable.

**Triggers:** When dde-daemon runs under a non-Treeland Wayland compositor.

**Suggested fix:** Detect the Treeland compositor specifically before selecting the Treeland DConfig path, or retain the existing layout path for other Wayland environments.
</issue_to_address>

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fly602, mhduiy

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