Add MCP Toplist rank badge

[chrstphe]

Hi! MCP Toplist tracks 81,432 MCP servers across the major
registries, and Tianji is currently ranked #185.

This PR adds a small live badge to your README showing that rank — it updates
automatically as the leaderboard changes:

Totally fine to close if you'd rather not — and if you'd like your server's
data corrected or removed from the leaderboard, just say so here or open an
issue at the site. Thanks for building Tianji!

Summary by CodeRabbit

• Documentation
  • Added an MCP Toplist badge link at the top of the README.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 8c9e0c00-2725-4a12-8419-c2e31eaf3850

📥 Commits

Reviewing files that changed from the base of the PR and between 67314bb and 5f68991.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

The README now starts with an MCP Toplist badge linked to its destination. No public declarations or other README content changed.

Changes

README badge update

Layer / File(s)	Summary
Add MCP Toplist badge README.md	Adds a linked MCP Toplist badge at the beginning of the README.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: moonrailgun

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the change: adding an MCP Toplist rank badge to the README.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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Warning

⚠️ This pull request has been flagged as potential spam (promotional) by CodeRabbit slop detection and should be reviewed carefully.