fix: read WebUI versions from the served asset directory

[wcqqq1214]

With --webui-dir dashboard/dist, version queries and update checks can read stale data/dist assets and falsely report a WebUI update.

Modifications

• Read WebUI versions from the served directory across public/authenticated queries and update checks.

• Preserve default lookup when no directory is configured; return null if the served directory has no version marker, without borrowing another directory's version.

• Keep existing update comparison behavior.

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results

• Verified matching/mismatching versions, missing markers, and default lookup through both API families and authentication paths.
• Existing Dashboard, FastAPI, stats, and startup suites: 264 passed. No test files changed.
• ruff format ., ruff check ., and git diff --check: passed.

Checklist

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 📚 I checked the affected WebUI instructions and screenshots in docs/zh and docs/en against the changed navigation, page structure, and labels, and updated them in this PR (or explained why no documentation update is needed). For renamed, moved, or merged entry points, I included an old entry → new entry mapping in the documentation and changelog.
  / 我已对照变化后的 WebUI 入口、页面结构和术语，核对并在本 PR 中更新 docs/zh 和 docs/en 的相关操作说明与截图（或说明无需更新文档的原因）。入口改名、移动或合并时，已在文档和 changelog 中补充 旧入口 → 新入口 对照。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Use the dashboard’s served asset directory as the source of truth for WebUI version reporting and update checks.

Bug Fixes:

• Read WebUI versions from the directory currently served by the dashboard for authenticated and public version queries and update checks.
• Return no WebUI version when the configured served directory lacks a version marker instead of falling back to stale assets.

Enhancements:

• Preserve the existing default version lookup when no served directory is configured while retaining current update comparison behavior.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

---

Sourcery is free for open source - if you like our reviews please consider sharing them ✨

• X
• Mastodon
• LinkedIn
• Facebook