d81cade7cc
- the customer contract PDF stream applies assertContractPdfPath like the
admin and public contract routes
- OG previews fall back to the site card for draft, archived and
deactivated galleries instead of leaking name, date and welcome message
- video Range requests are validated before the 206 is written; a NaN,
inverted or out-of-file range now answers 416
- share-token comparisons in gallery resolve/info use the constant-time
helper share-login already used
- middleware/photoAuth.js and the galleryAuth/photoAuth/verifyGalleryAccess
exports of middleware/auth.js were unreferenced since the static mounts
went; the auth.js copy had neither slug binding nor issuer pin, so it is
removed before anyone mounts it
(cherry picked from commit 835312e8e6)