docs(readme): remove QR code example from quick start

[BlackHole1]

The QR code line was an inaccurate example of what the bundled oo skill routes to a hosted capability, so drop it from both the English and Chinese README to avoid implying an unsupported workflow.

[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: 50c894c2-e491-4d13-8d22-da8871952943

📥 Commits

Reviewing files that changed from the base of the PR and between e897211 and cfb6cbc.

📒 Files selected for processing (2)

• README-ZH_CN.md
• README.md

💤 Files with no reviewable changes (2)

• README-ZH_CN.md
• README.md

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Summary by CodeRabbit

• Documentation
  • Updated Quick Start examples demonstrating Gmail email summarization using the /oo feature. Both English and Chinese documentation refreshed with the new example.

Walkthrough

This PR updates the quick start example prompts in both the English and Chinese README files. The example instruction shown to users is changed from generating a QR code for https://oomol.com to summarizing the latest 5 Gmail messages. Both changes maintain the existing explanation of the /oo trigger prefix convention used throughout the documentation.

Possibly related PRs

• oomol-lab/oo-cli#226: Both PRs modify the same README "Quick start" /oo Gmail summarization example.
• oomol-lab/oo-cli#224: Both PRs modify the README*.md "快速开始" /oo prompt example with the QR code and Gmail summarization variations.
• oomol-lab/oo-cli#223: Both PRs modify the README.md and README-ZH_CN.md "Quick start" content around the /oo prompt convention with example updates.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title follows the required format <type>(<scope>): <subject> with 'docs' as type and 'readme' as scope, accurately reflecting the removal of the QR code example from the README files.
Description check	✅ Passed	The description is directly related to the changeset, explaining the rationale for removing the QR code example from both README files to avoid implying an unsupported workflow.
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.

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✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch improve-readme-2

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