docs: fix ecosystem cross-links in README

[chatman-media]

Summary

• Remove the broken "Reference implementation" reference to the private chatman-media/sales-guru repo in all three language sections (EN/RU/ZH). Public readers following that link hit a 404, and there is no public pgvector IKbStore adapter to repoint it to.
• Add a used by @chatman-media/sales badge, matching the badge style already used in the sales and storage package READMEs.

Why

The chatman-media ecosystem has three public packages with a clear dependency chain (storage → sales → rag). The sales and storage READMEs already carry ecosystem badges, but the rag README was inconsistent — it had no ecosystem badge and pointed readers to a private repo. This brings rag in line with the other two.

Notes for reviewers

• README-only change. Commit uses the docs: prefix, so semantic-release will not cut a new version.
• The README already shows an inline IKbStore implementation sketch and ships InMemoryKbStore in-package, so no replacement text was needed for the removed reference.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between 28e1459 and 778fd7d.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/peaceful-perlman-a2d63c

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[github-actions]

🎉 This PR is included in version 1.2.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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