A folder that Bindery made hid a missing volume mount. The books went
to a folder inside the container, and CWA never saw them. A missing
folder is now an error in the log at the start, and each upload fails
with a message that names the mount.
Logins follow shelfmark: none, CWA accounts, or a reverse proxy header.
CWA accounts are checked against the OPDS feed, with a lockout after
repeated wrong passwords. An API key works in every mode, and changes
need an X-Requested-With header or the key. URL_BASE serves the app
under a path prefix.
tim