Use vipsthumbnail as the primary still-image path for both thumbnails
and previews (shared serveGenerated), falling back to the pure-Go
imaging pipeline when vips isn't on PATH. vips shrinks on load (e.g.
JPEG DCT scaling), so a 200+ Mpx photo is resized in a fraction of the
memory and CPU of a full in-process decode and no longer exceeds the
decode cap — the source that previously got only a placeholder now gets
a real thumbnail and preview. The output JPEG is written straight to the
cache (atomic temp→rename), fit within the target box and never upscaled.
The in-process pixel cap now guards only the pure-Go fallback.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
H1K0
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