[GCWing]

Summary

• Move the WeChat community QR code above the demo video in the English, Simplified Chinese, and Japanese READMEs.
• Display it at 147 pixels wide and link it to the full-size PNG.
• Preserve the existing community anchors.

Type and Areas

Documentation, repository READMEs.

Motivation / Impact

Readers can find the WeChat community near the top of the page, with a compact QR code.

Verification

• git diff --check origin/main...HEAD passed.
• Checked QR placement, link targets, and existing section anchors in all three READMEs.
• Verified with Core Image that the QR code decodes to the same content at 147 × 147 pixels.
• This AI-assisted documentation change was lightly tested. Runtime and remote scenarios were outside the scope of the change.

Checklist

• This PR is focused and does not include secrets, temporary prompts, generated scratch files, or unrelated artifacts.
• Relevant verification is recorded above.
• User-facing docs and locales are updated where applicable.