Closes#686
- Add trekPhotoCache service: SHA1-keyed disk cache under uploads/photos/trek/,
1h TTL, in-flight dedup map to prevent stampedes on concurrent requests
- Add migration 108: trek_photo_cache_meta table
- Hook cache into streamPhoto for Immich/Synology thumbnail path;
originals bypass cache
- Add fetchImmichThumbnailBytes / fetchSynologyThumbnailBytes returning
Buffer instead of piping, used by the cache layer
- Add scheduler entry (every 2h + startup sweep) to evict expired disk
files and DB rows via sweepExpired()
- Client: convert journey tab conditional-mount to hidden-toggle so
img elements stay in DOM across tab switches, preventing redundant
thumbnail requests on rapid tab changes
- Expose invalidateSize() on JourneyMapHandle; call it on map tab
activation to fix Leaflet rendering in previously-hidden container
b5b1d32b31