fix: correct inaccuracies across docs and config

[devin-ai-integration]

Summary

Validated all documentation and config files in the repo and fixed 6 inaccuracies:

1. README.md: Project structure listed docs/ but the actual directory is guide/.
2. config.mts (logo): logo referenced /hflive-techdoc-logo.webp but only .svg exists in public/ — the site logo was broken.
3. config.mts (favicon): Favicon type was "image" instead of the correct MIME type "image/svg+xml".
4. hflive13.0-techdoc.md: Image path on line 248 used a backslash (image\校友连线接线图-提高.svg) instead of a forward slash.
5. lyrics-display.md: A space before {.dark-invert} caused the class to be applied to the wrapping <p> element instead of the <img> — inconsistent with all other image references.
6. custom.css: The .dark-invert rule was wrapped in @media (prefers-color-scheme: dark), which meant dark mode image inversion would fail when a user manually toggles dark mode while their OS is set to light mode. Removed the unnecessary media query wrapper.

Build passes cleanly after all changes.

Review & Testing Checklist for Human

• Verify the site logo renders correctly on the deployed site (was broken due to .webp reference)
• Toggle dark mode manually (while your OS is in light mode) and check that SVG diagrams with .dark-invert class are properly inverted — this was broken before
• Check that the 歌词显示方案选型 image in guide/lyrics-display inverts in dark mode (the {.dark-invert} was on <p> instead of <img>)
• Verify the 校友连线接线图-提高 image renders in guide/hflive13.0-techdoc (had backslash path)

Notes

Two images exist in guide/image/ but are not referenced by any documentation page: 2021春晚实际接线图.svg and 人员组织架构.svg. These may be planned for future use, so they were not removed.

Link to Devin session: https://app.devin.ai/sessions/1ff79d2da5464cdbb7a62069ca8210c0
Requested by: @xiaoxuan010

[devin-ai-integration]

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[Copilot]

Pull request overview

Documentation and configuration cleanup that fixes six small but real correctness issues across the VitePress site: a stale directory name in the README, a broken logo path, an invalid favicon MIME type, a Windows-style backslash in a Markdown image path, an inert {.dark-invert} attribute on a lyrics-display image, and an over-restrictive prefers-color-scheme wrapper around the dark-mode image-invert rule.

Changes:

• Fix README project structure (docs/ → guide/) and correct two config.mts issues (logo extension and favicon MIME type).
• Fix one Markdown image path separator and one misplaced {.dark-invert} attribute so the class targets the <img>.
• Remove the @media (prefers-color-scheme: dark) wrapper in custom.css so manual dark-mode toggling still inverts SVGs.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Updates documented project structure from docs/ to actual guide/ directory.
.vitepress/config.mts	Corrects favicon type to image/svg+xml and logo path to existing .svg asset.
.vitepress/theme/custom.css	Drops prefers-color-scheme wrapper so manual dark-mode toggle still inverts images.
guide/hflive13.0-techdoc.md	Replaces backslash with forward slash in image/...svg path.
guide/lyrics-display.md	Removes stray space so {.dark-invert} applies to the image, not the wrapping <p>.

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