Add thumbnailService that lazy-generates a WebP thumbnail (800px max, q80) on
first GET /api/photos/:id/thumbnail request using sharp. The generated file is
stored at uploads/journey/thumbs/<sha1>.webp and the path is persisted to
trek_photos.thumbnail_path so subsequent requests are served directly from disk.
Also populates width/height as a side-effect.
streamPhoto now branches on kind for local file_path rows — thumbnail requests
use the stored/generated thumb path; original requests (and fallback when thumb
generation fails) continue to serve the full file. Remote providers (Immich,
Synology) are unaffected.
jubnl
7c9e945b8c