feat: AniList reading status integration

- Add full AniList integration: OAuth connect, series linking, push/pull sync
- Push: PLANNING/CURRENT/COMPLETED based on books read vs total_volumes (never auto-complete from owned books alone)
- Pull: update local reading progress from AniList list (per-user)
- Detailed sync/pull reports with per-series status and progress
- Local user selector in settings to scope sync to a specific user
- Rename "AniList" tab/buttons to generic "État de lecture" / "Reading status"
- Make Bédéthèque and AniList badges clickable links on series detail page
- Fix ON CONFLICT error on series link (provider column in PK)
- Migration 0054: fix series_metadata missing columns (authors, publishers, locked_fields, total_volumes, status)
- Align button heights on series detail page; move MarkSeriesReadButton to action row

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

apps/backoffice/lib/i18n/en.ts

@@ -195,6 +195,23 @@ const en: Record<TranslationKey, string> = {
   "libraryActions.metadataRefreshSchedule": "Auto-refresh",
   "libraryActions.metadataRefreshDesc": "Periodically re-fetch metadata for existing series",
   "libraryActions.saving": "Saving...",
+  "libraryActions.sectionReadingStatus": "Reading Status",
+  "libraryActions.readingStatusProvider": "Reading Status Provider",
+  "libraryActions.readingStatusProviderDesc": "Syncs reading states (read / reading / planned) with an external service",
+
+  // Reading status modal
+  "readingStatus.button": "Reading status",
+  "readingStatus.linkTo": "Link to {{provider}}",
+  "readingStatus.search": "Search",
+  "readingStatus.searching": "Searching…",
+  "readingStatus.searchPlaceholder": "Series title…",
+  "readingStatus.noResults": "No results.",
+  "readingStatus.link": "Link",
+  "readingStatus.unlink": "Unlink",
+  "readingStatus.changeLink": "Change",
+  "readingStatus.status.linked": "linked",
+  "readingStatus.status.synced": "synced",
+  "readingStatus.status.error": "error",
 
   // Library sub-page header
   "libraryHeader.libraries": "Libraries",
@@ -602,6 +619,59 @@ const en: Record<TranslationKey, string> = {
   "settings.telegramHelpChat": "Send a message to your bot, then open <code>https://api.telegram.org/bot&lt;TOKEN&gt;/getUpdates</code> in your browser. The <b>chat id</b> is in <code>message.chat.id</code>.",
   "settings.telegramHelpGroup": "For a group: add the bot to the group, send a message, then check the same URL. Group IDs are negative (e.g. <code>-123456789</code>).",
 
+  // Settings - AniList
+  "settings.anilist": "Reading status",
+  "settings.anilistTitle": "AniList Sync",
+  "settings.anilistDesc": "Sync your reading progress with AniList. Get a personal access token at anilist.co/settings/developer.",
+  "settings.anilistToken": "Personal Access Token",
+  "settings.anilistTokenPlaceholder": "AniList token...",
+  "settings.anilistUserId": "AniList User ID",
+  "settings.anilistUserIdPlaceholder": "Numeric (e.g. 123456)",
+  "settings.anilistConnected": "Connected as",
+  "settings.anilistNotConnected": "Not connected",
+  "settings.anilistTestConnection": "Test connection",
+  "settings.anilistLibraries": "Libraries",
+  "settings.anilistLibrariesDesc": "Enable AniList sync per library",
+  "settings.anilistEnabled": "AniList sync enabled",
+  "settings.anilistLocalUserTitle": "Local user",
+  "settings.anilistLocalUserDesc": "Select the local user whose reading progress is synced with this AniList account",
+  "settings.anilistLocalUserNone": "— Select a user —",
+  "settings.anilistSyncTitle": "Sync",
+  "settings.anilistSyncDesc": "Push local reading progress to AniList. Rules: none read → PLANNING · at least 1 read → CURRENT (progress = volumes read) · all published volumes read (total_volumes known) → COMPLETED.",
+  "settings.anilistSyncButton": "Sync to AniList",
+  "settings.anilistPullButton": "Pull from AniList",
+  "settings.anilistPullDesc": "Import your AniList reading list and update local reading progress. Rules: COMPLETED/CURRENT/REPEATING → books marked read up to the progress volume · PLANNING/PAUSED/DROPPED → unread.",
+  "settings.anilistSyncing": "Syncing...",
+  "settings.anilistPulling": "Pulling...",
+  "settings.anilistSynced": "{{count}} series synced",
+  "settings.anilistUpdated": "{{count}} series updated",
+  "settings.anilistSkipped": "{{count}} skipped",
+  "settings.anilistErrors": "{{count}} error(s)",
+  "settings.anilistLinks": "AniList Links",
+  "settings.anilistLinksDesc": "Series linked to AniList",
+  "settings.anilistNoLinks": "No series linked to AniList",
+  "settings.anilistUnlink": "Unlink",
+  "settings.anilistSyncStatus": "synced",
+  "settings.anilistLinkedStatus": "linked",
+  "settings.anilistErrorStatus": "error",
+  "settings.anilistUnlinkedTitle": "{{count}} unlinked series",
+  "settings.anilistUnlinkedDesc": "These series belong to AniList-enabled libraries but have no AniList link yet. Search each one to link it.",
+  "settings.anilistSearchButton": "Search",
+  "settings.anilistSearchNoResults": "No AniList results.",
+  "settings.anilistLinkButton": "Link",
+  "settings.anilistRedirectUrlLabel": "Redirect URL to configure in your AniList app:",
+  "settings.anilistRedirectUrlHint": "Paste this URL in the « Redirect URL » field of your application at anilist.co/settings/developer.",
+  "settings.anilistTokenPresent": "Token present — not verified",
+  "settings.anilistPreviewButton": "Preview",
+  "settings.anilistPreviewing": "Loading...",
+  "settings.anilistPreviewTitle": "{{count}} series to sync",
+  "settings.anilistPreviewEmpty": "No series to sync (link series to AniList first).",
+  "settings.anilistClientId": "AniList Client ID",
+  "settings.anilistClientIdPlaceholder": "E.g. 37777",
+  "settings.anilistConnectButton": "Connect with AniList",
+  "settings.anilistConnectDesc": "Use OAuth to connect automatically. Find your Client ID in your AniList apps (anilist.co/settings/developer).",
+  "settings.anilistManualToken": "Manual token (advanced)",
+
   // Settings - Language
   "settings.language": "Language",
   "settings.languageDesc": "Choose the interface language",