feat: add series status, improve providers & e2e tests

- Add series status concept (ongoing/ended/hiatus/cancelled/upcoming)
  with normalization across all providers
- Add status field to series_metadata table (migration 0033)
- AniList: use chapters as fallback for volume count on ongoing series,
  add books_message when both volumes and chapters are null
- Bedetheque: extract description from meta tag, genres, parution status,
  origin/language; rewrite book parsing with itemprop microdata for
  clean ISBN, dates, page counts, covers; filter placeholder authors
- Add comprehensive e2e provider tests with field coverage reporting
- Wire status into EditSeriesForm, MetadataSearchModal, and series page

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/backoffice/lib/api.ts

@@ -516,6 +516,7 @@ export type SeriesMetadataDto = {
   publishers: string[];
   start_year: number | null;
   total_volumes: number | null;
+  status: string | null;
   book_author: string | null;
   book_language: string | null;
   locked_fields: Record<string, boolean>;
@@ -657,6 +658,7 @@ export type SyncReport = {
   books: BookSyncReport[];
   books_matched: number;
   books_unmatched: number;
+  books_message?: string;
 };
 
 export type MissingBooksDto = {