docs: add README header screenshot

[ymkiux]

Summary

Add a hero screenshot to the top of both README files to make the project’s Web UI more immediately visible.

Changes

• Add a linked screenshot banner to:
  • README.md
  • README.zh.md
• Image is hosted on ImgBB and links back to the source page:
  • https://ibb.co/CKffDS2K

Notes

• This is documentation-only (no runtime / behavior changes).

Summary by CodeRabbit

• Documentation
  • Added visual preview screenshot to the README header section in both English and Chinese versions

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 74507c67-f28d-47b1-a7b4-b816b44ba6d3

📥 Commits

Reviewing files that changed from the base of the PR and between 8545c5d and dd7a7ec.

📒 Files selected for processing (2)

• README.md
• README.zh.md

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📝 Walkthrough

Walkthrough

This PR adds embedded screenshot images to both English and Chinese README files by inserting HTML <br /> and <img> tags within the centered header sections to display visual preview content.

Changes

Cohort / File(s)	Summary
Documentation Screenshots README.md, README.zh.md	Adds embedded screenshot images to the centered header section of both README files using HTML markup for visual preview display.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• docs+proxy+ui: update README, add responses shim, and refine usage #98: Updates README files to include embedded visuals and header content modifications in the same section.
• docs(readme): show logo in both readmes #81: Modifies README.md header with HTML <img> elements for screenshot display.

Suggested reviewers

• awsl233777

Poem

🐰 A screenshot here, a picture there,
In markdown files with utmost care,
Visual tales now come alive,
Making READMEs truly thrive! ✨

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-screenshot-v0025

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