docs: remove README placeholder screenshot

[Astro-Han]

Summary

Removes the remaining README session screenshot placeholder from the English and Chinese README files.

Deletes the unused placeholder SVG asset.

Why

PR #322 merged with the real homepage screenshot, but the session screenshot placeholder was still present. This follow-up removes the placeholder until there is a real session screenshot to add.

Related Issue

Follow-up to #322.

How To Verify

git diff --check origin/dev..HEAD
rg -n "placeholder|占位|pawwork-session" README.md README_CN.md assets/readme || true

No runtime tests were run because this is a documentation-only cleanup.

Screenshots or Recordings

Not applicable. This PR removes a placeholder image and keeps the existing real homepage screenshot.

Checklist

• I linked the related issue, or stated why there is no issue
• This PR has type, scope, and priority labels, or I requested maintainer labeling
• I listed the relevant verification steps, including tests when behavior changed
• I manually checked visible UI or copy changes when needed, with screenshots or recordings
• I considered macOS and Windows impact for desktop, packaging, updater, signing, paths, shell, or permissions changes
• I called out docs, release notes, dependencies, permissions, credentials, deletion behavior, or generated/local file changes when relevant
• I am targeting dev, and my PR title and commit messages use Conventional Commits in English

Summary by CodeRabbit

• Documentation
  • Removed placeholder image reference from the main README
  • Removed placeholder image reference from the Chinese README documentation

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: ac271a45-400e-4f18-a498-8b2f16cae101

📥 Commits

Reviewing files that changed from the base of the PR and between 676dd60 and 498562f.

⛔ Files ignored due to path filters (1)

• assets/readme/pawwork-session.svg is excluded by !**/*.svg

📒 Files selected for processing (2)

• README.md
• README_CN.md

💤 Files with no reviewable changes (2)

• README.md
• README_CN.md

📜 Recent review details

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (12)

• GitHub Check: smoke-macos-arm64
• GitHub Check: unit-windows-opencode-config-project
• GitHub Check: unit-opencode
• GitHub Check: unit-windows-app
• GitHub Check: unit-windows-opencode-session
• GitHub Check: unit-windows-opencode-server-tools
• GitHub Check: unit-windows-desktop
• GitHub Check: unit-desktop
• GitHub Check: unit-app
• GitHub Check: typecheck
• GitHub Check: e2e-artifacts
• GitHub Check: analyze-js-ts

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📝 Walkthrough

Walkthrough

This pull request removes placeholder image references from both the English and Chinese README files, specifically deleting two lines that referenced a "PawWork session screen placeholder" image section.

Changes

Cohort / File(s)	Summary
Documentation cleanup README.md, README_CN.md	Removes placeholder session screen image references from documentation files.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• docs: refresh README positioning #322: Both PRs modify README and README_CN content regarding session screenshot/placeholder image handling.
• docs: update README positioning #212: Both PRs modify README.md and README_CN.md content, with this PR removing session placeholder assets while the related PR addressed screenshot TODOs.

Suggested labels

documentation, P3, app

Poem

🐰 A little hop, a little skip,
We clean the docs, no placeholder trip!
Session shadows fade away,
Cleaner READMEs brighten the day! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically summarizes the main change: removing a README placeholder screenshot. It directly relates to the primary objective of the PR.
Description check	✅ Passed	The description comprehensively follows the template with all required sections: Summary, Why, Related Issue, How To Verify, Screenshots or Recordings, and a completed Checklist.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/remove-readme-placeholder

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[gemini-code-assist]

Code Review

This pull request removes the pawwork-session.svg placeholder image and its corresponding references from both the English and Chinese README files. I have no feedback to provide as there are no review comments.