Add README video previews

[Moskize91]

Summary

• add YouTube preview image/link to the English README
• add Bilibili preview image/link to the Chinese README
• include localized 16:9 preview assets under docs/images

Validation

• git diff --check

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ad30cb20-c9e5-4395-abe2-9a17860b9ecb

📥 Commits

Reviewing files that changed from the base of the PR and between b0e1639 and eca710f.

⛔ Files ignored due to path filters (2)

• docs/images/bilibili-cover.png is excluded by !**/*.png
• docs/images/youtube-cover.png is excluded by !**/*.png

📒 Files selected for processing (2)

• README.md
• README_zh-CN.md

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Summary by CodeRabbit

• Documentation
  • Added a “Watch the video” thumbnail link to the main README, placed near the start of the guide.
  • Added a matching video thumbnail link to the Chinese README for easier access to the introduction video.

Walkthrough

This change adds a video thumbnail link to both README.md and README_zh-CN.md, positioned before the Quick Start section. The English README includes a "Watch the video" link pointing to YouTube, while the Chinese README includes a corresponding Bilibili video cover link. No code or public API changes are involved.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title matches the change, but it does not follow the required <type>(<scope>): <subject> format.	Rewrite it as feat(readme): add video previews or a similar English title that matches the required format.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description matches the README video preview additions and mentions the updated assets and validation.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch codex/update-readme-media

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