007_seed_data.sql: insert 10 MIME types (4 image, 6 video) with their canonical extensions into core.mime_types. disk.go: register golang.org/x/image/webp decoder so imaging.Open handles WebP still images. Videos (mp4, mov, avi, webm, 3gp, m4v) continue to go through the ffmpeg frame-extraction path. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>