docs: serve the DeepWiki badge from shields.io

[dinwwwh]

Summary

The "Ask DeepWiki" badge renders as a broken image on GitHub. https://deepwiki.com/badge.svg now sits behind a Vercel bot challenge that answers non-browser clients with HTTP 429 and an HTML page instead of the SVG. GitHub's image proxy (camo) is one of those clients, so it can't load the badge. Opening the URL directly in a browser still works, which is why it only breaks on github.com.

This swaps the image for a static shields.io badge, written the same way as the other badges in the header. The link still points to https://deepwiki.com/middleapi/openapi-spec.

-    ``<img src="https://deepwiki.com/badge.svg" alt="Ask DeepWiki">``
+    ````<img alt="Ask DeepWiki" src="https://img.shields.io/badge/Ask-DeepWiki-blue" />````

• 3 READMEs: the root README.md, packages/types and packages/downgrader.
• Many other projects made the same swap for the same reason. If DeepWiki stops challenging badge.svg, this can be reverted.

The same fix is going into middleapi/orpc, middleapi/standard-server and middleapi/uncheck.

Test plan

• The same line passes eslint in middleapi/orpc. Lint wasn't run here because this repo's dependencies weren't installed.
• The badge renders in this PR's rendered README. I couldn't check this from my environment, which can't reach shields.io or camo.

🤖 Generated with Claude Code

https://claude.ai/code/session_01K14B7gKEeDuQMw6fenMV8x

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Generated by Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[pullfrog]

✅ No new issues found.

Reviewed changes — verified the DeepWiki badge swap across the three READMEs.

• Badge source swapped — https://deepwiki.com/badge.svg → https://img.shields.io/badge/Ask-DeepWiki-blue in the root, packages/types, and packages/downgrader README headers, leaving the https://deepwiki.com/middleapi/openapi-spec anchor unchanged.
• Claim verified — https://img.shields.io/badge/Ask-DeepWiki-blue returns 200 image/svg+xml, while https://deepwiki.com/badge.svg returns 429 text/html, confirming the bot-challenge breakage the description reports.
• Style consistent — the new markup (self-closing />, alt first, 4-space indent) matches the sibling badges in the same <div align="center"> block.

  ^{｜ View workflow run ｜ Using deepseek-v4.1-flash (free via Pullfrog for OSS) ｜ 𝕏}

[codspeed]

Merging this PR will not alter performance

✅ 20 untouched benchmarks

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_{Comparing claude/brave-dirac-4hl9r5 (3d30efd) with main (b53756a)¹}

Footnotes

1. No successful run was found on main (3c1b25a) during the generation of this report, so b53756a was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩