- stream: serving goes through http.ServeContent, so Range/If-Range/
If-Modified-Since are correct for every media type by construction
- progress: the polymorphic store. One row per user/item/file; the PK includes
the file so multi-track audiobooks resume per track later. Finished is
inferred when position reaches duration.
- media: generic item endpoints (detail, file, cover, progress, recent). Every
one routes through auth.CanAccessLibrary; an unauthorised item 404s.
- covers: a per-kind extractor registry. Extraction is lazy and recorded in
the assets table. A missing cover is a placeholder, never a 500.
- modules/ebooks: EPUB parsing (container.xml -> OPF -> metadata, spine, cover
with three fallback strategies), cover extraction to /config, and lazy
metadata parsing so parser fixes need no rescan.
Verified against a generated EPUB: title/2 authors/language/publisher/spine,
cover served as PNG, range request returned 206 with correct Content-Range,
progress round-tripped.
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