fix: preserve blog media paths under developers mount

[decofe]

Summary

• Rewrite rendered /blog/... media URLs as mount-relative URLs.
• Preserve /blog paths in previews and /developers/blog paths on tempo.xyz.
• Add a regression test covering image, video source, and fallback link URLs.

Production evidence

• Images currently request /blog/... and return 404 text/html.
• Videos currently receive the same HTML 404 page as 206 text/html.
• The corresponding /developers/blog/... assets return 200 image/png and 200 video/mp4.

Testing

• pnpm exec biome check src/marketing/blogPlugin.ts src/marketing/blogPlugin.test.ts
• pnpm check:types
• Generated virtual blog data contains mount-safe paths for every Voight-Kampff image and video
• Vitest startup is locally blocked by the existing external OpenAPI fetch timeout; CI will run the committed regression test

Prompted by: tom

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Project	Deployment	Actions	Updated (UTC)
tempo-docs	Ready	Preview	Aug 19, 2026 4:53pm