Make every stat bucket a clickable filter mini-album, rendered in parallel

Generalises the per-camera mini-albums to every stats category: clicking any
row on the stats page (camera, lens, year, month, aperture, shutter, ISO, focal
length, megapixels, aspect, orientation, format, exposure program, metering,
white balance, flash) now opens a filter mini-album of just the matching photos,
with view pages whose prev/next cycle within the filter.

Aggregation: a single _stats_tally now records, for every tallied bucket, the
bucket's photo list and a unique filename-safe "pagebase" (camera-canon-eos-r5,
iso-400, year-2023, ...) with collision resolution, exposed via STATS_FILTER_*
maps. The old camera-only STATS_CAMERA_SLUGS/PHOTOS/SLUG_OWNERS are gone.

Render: every bar/leaderboard row is wrapped in a link to its bucket's pagebase
via _stats_filter_link. render_filter_pages replaces render_camera_pages and
renders ALL filter mini-albums (gallery + per-photo view pages) reusing
camera.tmpl/cameraview.tmpl. The galleries/view pages reuse the album's shared
photos/thumbs/blurs assets -- only the HTML differs.

Parallelism: filter pages render through the shared job pool, throttled to
IMAGE_JOBS (the same pool the album view pages use). The album render warms every
photo's EXIF cache (via details pages) before the parallel filter render, so the
filter jobs only read the cache.

Tests updated for the new STATS_FILTER_* structures and extended to assert
non-camera filter mini-albums (orientation, ISO) and their stats-page links.

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

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