Client-side paging of listPhotosWithNotes stopped early for BasePath users:
the sidecar post-filters each page by BasePath, so a full upstream page can
arrive short, tripping the `length < PAGE` end condition before the library
is exhausted — hiding notes past the first slice.
Add GET /api/sidecar/notes: the sidecar pages /api/v1/photos to completion
(keying the loop off the raw upstream page length), filters to non-empty
Caption under the caller's BasePath, dedupes by UID, and returns the set.
listPhotosWithNotes now calls this single endpoint.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>