feat: add session-control and multitaskview protocols

[wineee]

1. Add treeland-session-control-unstable-v1: lock/show_shutdown_menu/switch_user
2. Add treeland-multitaskview-unstable-v1: set_state + state event, bind sync
3. Mark dde-shell lockscreen/multitaskview interfaces deprecated non-functional
4. Register both protocols in CMakeLists and update dde/public READMEs
5. Note whole dde-shell protocol slated for removal in a future release

Log: New session-control and multitaskview protocols; dde-shell interfaces deprecated

Influence:

1. Install the package and verify both new XML files land in the treeland-protocols data dir
2. Run wayland-scanner client-header and private-code on both new XML files to confirm parsing
3. Check all four READMEs list the new protocols and the dde-shell deprecation notes
4. Reconfigure cmake and confirm the build succeeds with the updated DDE file list

feat: 新增 session-control 与 multitaskview 协议

1. 新增 session-control 协议：单例全局，含 lock、show_shutdown_menu、switch_user
2. 新增 multitaskview 协议：set_state 请求、state 事件、bind 时状态同步
3. dde-shell 的 lockscreen/multitaskview 接口标注废弃不可用
4. CMakeLists 注册新协议，同步更新 dde/public 中英文 README
5. README 注明整个 dde-shell 协议未来将彻底移除

Log: 新增会话控制与多任务视图协议；dde-shell 相关接口标记废弃

Influence:

1. 安装后确认两个新 XML 安装到 treeland-protocols 数据目录
2. 对两个新 XML 运行 wayland-scanner 校验，确认可正常解析生成
3. 检查四个 README 均列出新增协议及 dde-shell 废弃说明
4. 重新运行 cmake 配置，确认构建通过

Summary by Sourcery

Introduce dedicated session-control and multitaskview protocols while deprecating the corresponding non-functional DDE shell interfaces.

New Features:

• Add an experimental session-control protocol for locking the session, opening shutdown/session actions, and switching users.
• Add an experimental multitaskview protocol with mode control, state notifications, and bind-time synchronization.

Enhancements:

• Deprecate the DDE shell lockscreen and multitaskview interfaces as non-functional and document their replacement by the new protocols.

Build:

• Register the new DDE protocol XML files for installation.

Documentation:

• Update English and Chinese protocol documentation with the new protocols and the planned removal of the DDE shell protocol.

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: wineee

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• debian/deepin/OWNERS

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Reviewer's Guide

Adds new singleton session-control and multitaskview protocols with explicit action/state semantics, registers them for installation, and deprecates the corresponding non-functional dde-shell interfaces with migration guidance and future-removal notes.

Sequence diagram for direct binding to the new control protocols

sequenceDiagram
    participant Client as Privileged DDE Client
    participant Compositor

    Client->>Compositor: bind treeland_session_control_v1
    Client->>Compositor: lock()
    Client->>Compositor: show_shutdown_menu()
    Client->>Compositor: switch_user()

    Client->>Compositor: bind treeland_multitaskview_v1
    Compositor-->>Client: state(current_state)
    Client->>Compositor: set_state(state)
    Compositor-->>Client: state(new_state)
    Compositor-->>Client: state(external_change)

Loading

File-Level Changes

Change	Details	Files
Introduce a privileged singleton protocol for session and power actions.	Add lock, shutdown/session-menu, and user-switch one-shot requests. Document singleton binding, privilege expectations, and stateless behavior.	dde/treeland-session-control-unstable-v1.xml dde/README.md dde/README.zh_CN.md
Introduce a synchronized multitaskview mode-control protocol.	Add normal/active state values, set_state request, and state event. Define bind-time state synchronization and single-client binding semantics.	dde/treeland-multitaskview-unstable-v1.xml dde/README.md dde/README.zh_CN.md
Deprecate the legacy DDE shell lockscreen and multitaskview APIs and document migration.	Mark legacy manager requests and interfaces non-functional. Point consumers to the new singleton globals and note eventual removal of the entire dde-shell protocol. Update English and Chinese protocol documentation.	public/treeland-dde-shell-v1.xml public/README.md public/README.zh_CN.md
Register the new DDE protocol XML files for installation.	Add both XML files to the DDE protocol file list used by the build and install configuration.	CMakeLists.txt

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[deepin-bot]

TAG Bot

New tag: 0.6.0
DISTRIBUTION: unstable
Suggest: synchronizing this PR through rebase #108