fix: change default ambient brightness to off

[fly602]

Backport to release/2500

本次为提交 ffefe3d8（即 PR #152，"fix: change default ambient brightness to off"）的 cherry-pick backport 到 release/2500 分支。

改动内容

将 DConfig 配置项 ambientLightAdjustBrightness 的默认值从 true 改为 false，即默认关闭环境光自动亮度功能（关联 PMS: BUG-372191）。

仅 1 个文件、1 行变更：

• src/plugin-qt/ambient-brightness/configs/org.deepin.dde.daemon.ambient-brightness.json
  • "value": true → "value": false

DConfig meta 结构（magic/version/contents/serial/flags）保持完好，JSON 校验通过；运行时代码通过 DConfig 动态读取该键，默认值变更即可生效，无需改 cpp。

关联

• 上游 PR：fix: change default ambient brightness to off #152（已合并入 master）
• PMS：BUG-372191
• Multica issue：DDE-125 — https://agent-dev.uniontech.com/dde/issues/6b9f9df7-08d6-4f75-95f7-4beb8d46f45f

说明

• cherry-pick 保留原提交作者（fuleyi <fuleyi@uniontech.com>）与完整 commit message（含 PMS: BUG-372191），cherry-pick 无冲突。
• 已通过代码审核（100 分 / 优秀 / Low 风险，0 条意见）。
• 本 PR 为 draft / 待审核状态，合并由人工确认，请勿自动合并。

注：本 Multica issue（DDE-125）的 done 状态由用户人工确认，PR 合并不应自动关闭该 issue。

Summary by Sourcery

Bug Fixes:

• Disable ambient-light automatic brightness by default by changing the DConfig default for ambientLightAdjustBrightness from enabled to disabled.

[deepin-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Backports a single configuration change to release/2500 that turns off ambient light-based automatic brightness by default via a DConfig JSON update.

File-Level Changes

Change	Details	Files
Default ambient light auto-brightness behavior is changed from enabled to disabled via DConfig in the release/2500 branch.	Update the DConfig key ambientLightAdjustBrightness default value from true to false so ambient brightness adjustment is off by default. Preserve existing DConfig JSON meta structure (magic/version/contents/serial/flags) and rely on runtime dynamic reading to pick up the new default without C++ code changes. Cherry-pick the original master commit (PR fix: change default ambient brightness to off #152) into release/2500 with original author and commit message intact, ensuring a clean, conflict-free backport.	src/plugin-qt/ambient-brightness/configs/org.deepin.dde.daemon.ambient-brightness.json

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: fly602

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