feat: protocol above rankings + badges + compare on /perp/[slug]

[Flotapponnier]

Summary

• Move Protocol/Vault section above Live benchmark results
• Add embeddable badges section (only for rank drop journal framing #1 appearances) with Copy HTML, Copy Markdown, Share on X
• Add "Compare to alternatives" section listing other perp venues sharing the same benches

Test plan

• Visit /perp/gains on staging — Protocol section should appear before the ranked bench list
• If gains leads any bench, badge cards appear with preview SVG + copy snippets
• Compare section shows other perp venues sorted by shared bench count