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>

infra/migrations/0054_fix_series_metadata_columns.sql

@@ -0,0 +1,30 @@
+-- Corrective migration: add series_metadata columns that may be missing if migrations
+-- 0022-0033 were baselined (marked applied) without actually running their SQL.
+-- All statements use IF NOT EXISTS / idempotent patterns so re-running is safe.
+
+-- From 0022: add authors + publishers arrays, remove old singular publisher column
+ALTER TABLE series_metadata ADD COLUMN IF NOT EXISTS authors    TEXT[] NOT NULL DEFAULT '{}';
+ALTER TABLE series_metadata ADD COLUMN IF NOT EXISTS publishers TEXT[] NOT NULL DEFAULT '{}';
+
+-- Migrate old singular publisher value if the column still exists
+DO $$
+BEGIN
+    IF EXISTS (
+        SELECT 1 FROM information_schema.columns
+        WHERE table_name = 'series_metadata' AND column_name = 'publisher'
+    ) THEN
+        UPDATE series_metadata
+           SET publishers = ARRAY[publisher]
+         WHERE publisher IS NOT NULL AND publisher != '' AND cardinality(publishers) = 0;
+        ALTER TABLE series_metadata DROP COLUMN publisher;
+    END IF;
+END $$;
+
+-- From 0030: locked_fields
+ALTER TABLE series_metadata ADD COLUMN IF NOT EXISTS locked_fields JSONB NOT NULL DEFAULT '{}';
+
+-- From 0031: total_volumes
+ALTER TABLE series_metadata ADD COLUMN IF NOT EXISTS total_volumes INTEGER;
+
+-- From 0033: status
+ALTER TABLE series_metadata ADD COLUMN IF NOT EXISTS status TEXT;