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/app/components/MarkSeriesReadButton.tsx

@@ -45,27 +45,27 @@ export function MarkSeriesReadButton({ seriesName, bookCount, booksReadCount }:
     <button
       onClick={handleClick}
       disabled={loading}
-      className={`inline-flex items-center gap-1 text-xs px-2 py-1 rounded-full font-medium transition-colors ${
+      className={`inline-flex items-center gap-1.5 px-3 py-1.5 rounded-lg border text-sm font-medium transition-colors disabled:opacity-50 ${
         allRead
-          ? "bg-green-500/15 text-green-600 dark:text-green-400 hover:bg-green-500/25"
-          : "bg-muted/50 text-muted-foreground hover:bg-primary/10 hover:text-primary"
-      } disabled:opacity-50`}
+          ? "border-green-500/30 bg-green-500/10 text-green-600 hover:bg-green-500/20"
+          : "border-border bg-card text-muted-foreground hover:text-foreground hover:border-primary"
+      }`}
     >
       {loading ? (
-        <svg className="w-3.5 h-3.5 animate-spin" fill="none" viewBox="0 0 24 24">
+        <svg className="w-4 h-4 animate-spin" fill="none" viewBox="0 0 24 24">
           <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
           <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
         </svg>
       ) : allRead ? (
         <>
-          <svg className="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24" strokeWidth={2}>
+          <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24" strokeWidth={2}>
             <path strokeLinecap="round" strokeLinejoin="round" d="M9 15 3 9m0 0 6-6M3 9h12a6 6 0 0 1 0 12h-3" />
           </svg>
           {label}
         </>
       ) : (
         <>
-          <svg className="w-3.5 h-3.5" fill="none" stroke="currentColor" viewBox="0 0 24 24" strokeWidth={2}>
+          <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24" strokeWidth={2}>
             <path strokeLinecap="round" strokeLinejoin="round" d="M9 12.75 11.25 15 15 9.75M21 12a9 9 0 1 1-18 0 9 9 0 0 1 18 0z" />
           </svg>
           {label}