Surfaces the analysis worker's NSFW moderation at the manga level:
- repo::manga FILTER_WHERE gains cw_include (AND, page-content-warning
join to mangas) and cw_exclude (NONE) clauses; ListQuery + binds
renumbered ($6/$7, LIMIT/OFFSET $8/$9).
- repo::page_analysis::warnings_for_manga: deduped, alphabetical union
across all the manga's pages.
- domain::MangaDetail gains content_warnings; get_detail populates it.
- api::mangas list accepts cw_include/cw_exclude (reusing the shared
parse_warnings_csv validator).
Tests: detail union (deduped/sorted) + empty case; list include/exclude
filter; unknown-warning 422. Existing manga tests still green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
