fix(dock): sync platform theme to tray plugin processes

[MyLeeJiEun]

1. Set DDE_TRAY_LOADER_REGISTER_PLATFORM_INTERFACE=1 in the tray loader plugin process env
2. Tell the plugin it is hosted by dde-shell's dockplugin compositor, so it registers DQWaylandPlatformInterface before creating DPlatformTheme
3. Ensure active color, theme, and font properties sync correctly to tray plugins

Log: Sync platform theme properties to tray plugin processes hosted by dde-shell.
Influence: Tray plugin visuals now follow the system theme correctly.

fix(dock): 同步平台主题到托盘插件进程

1. 在托盘插件进程环境中设置 DDE_TRAY_LOADER_REGISTER_PLATFORM_INTERFACE=1
2. 告知插件由 dde-shell 的 dockplugin 合成器托管，须在创建 DPlatformTheme 前注册 DQWaylandPlatformInterface
3. 确保活动色、主题、字体等属性正确同步到托盘插件

Log: 同步平台主题属性到由 dde-shell 托管的托盘插件进程。
PMS: BUG-372253
Influence: 托盘插件外观将正确跟随系统主题。

Summary by Sourcery

Bug Fixes:

• Ensure tray plugin processes hosted by the dock register the Wayland platform interface so active colors, themes, and fonts sync with the system.

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: MyLeeJiEun

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Sets a new environment variable for tray plugin processes so they can register the Wayland platform interface before creating DPlatformTheme, ensuring platform theme properties (active color, theme, fonts) sync correctly for dock-hosted tray plugins.

Sequence diagram for syncing platform theme to tray plugin processes

sequenceDiagram
    participant DockShell
    participant LoadTrayPlugins
    participant TrayPluginProcess
    participant DPlatformTheme

    DockShell->>LoadTrayPlugins: setProcessEnv
    LoadTrayPlugins->>TrayPluginProcess: start
    TrayPluginProcess->>TrayPluginProcess: main
    opt [DDE_TRAY_LOADER_REGISTER_PLATFORM_INTERFACE set]
        TrayPluginProcess->>DPlatformTheme: DPlatformTheme
    end

Loading

File-Level Changes

Change	Details	Files
Configure tray plugin subprocess environment to request registration of the platform interface before DPlatformTheme creation.	Extend setProcessEnv to insert DDE_TRAY_LOADER_REGISTER_PLATFORM_INTERFACE=1 into the tray plugin process environment Document in comments that dock-hosted tray plugins must register DQWaylandPlatformInterface before creating DPlatformTheme to sync active color, theme, and font properties	panels/dock/loadtrayplugins.cpp

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