Add read-only Baserow adapter

[7k777]

Summary

Adds a read-only Baserow adapter with 4 generic tools for table discovery, field discovery, row listing, and single-row retrieval.

The adapter supports both Baserow Cloud and self-hosted instances through BASEROW_URL, and uses Baserow Database Token authentication via Authorization: Token <token>.

Changes

• Added baserow.json with 4 read-only tools: list tables, list fields, list rows, and get row
• Added support for BASEROW_URL and BASEROW_API_TOKEN
• Added user_field_names=true for row requests so responses use readable field names
• Updated the adapter catalog and adapter count
• Added static adapter tests

Type

• Bug fix
• New feature
• Documentation
• Refactoring
• Performance improvement
• Other (describe below)

Testing

• Added/updated unit tests
• Tested manually (describe steps below)
• No tests needed (explain why)

Manual testing:

• Tested against a real Baserow Cloud instance using a read-only Database Token
• Verified list tables, list fields, list rows, and get row successfully
• Confirmed row responses use human-readable field names
• Adapter validator passes
• Backend test suite passes

Checklist

• My code follows the existing code style
• I have tested my changes locally
• I have updated documentation (if applicable)
• All existing tests pass (npm test)
• This PR has a descriptive title

Related Issues

Relates to #150

[github-actions]

👋 Welcome, @7k777, and thanks for opening your first PR on AnythingMCP!

A few quick pointers:

• Make sure CI is green before requesting review (Backend, Frontend, Playwright, CodeQL, Trivy).
• If this is a new adapter, the parametrised catalog.spec.ts test will validate it automatically.
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[github-actions]

All contributors have signed the CLA ✍️ ✅
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[7k777]

I have read the CLA Document and I hereby sign the CLA