um0 add per-camera filter pages

Implement render_camera_pages <html_dir> <backhref> in stats.source.sh: one
camera-<slug>.html per camera in STATS_CAMERA_SLUGS, reusing the aggregation's
collision-resolved slugs and per-camera photo lists so filenames match pm0's
leaderboard links. Each page reuses the shared header/footer chrome plus a new
camera.tmpl that renders an HTML-escaped camera heading, a pre-built thumbnail
grid, and a back-to-stats link.

Thumbnails reuse preview.tmpl's markup style (thumb image from thumbs/) but link
to the full-size image under photos/ rather than a per-photo view page, since the
view-page name is not derivable outside the album pagination loop. The photos and
thumbs dir names are fixed to match generate()'s render_album_pages call.

Cameras are walked in LC_ALL=C label order for reproducible output, and cameras
with no recorded photos are skipped. Adds the camera_name/camera_thumbs render
field specs and a tests/cli.sh case covering per-camera files, slug collisions,
HTML escaping, thumbnail link targets, and determinism.

This provides the function + template + tests only; wiring into generate() and
the STATS_PAGE toggle remain for rm0.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

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