feat: add reading_status_push job — differential push to AniList

Push reading statuses (PLANNING/CURRENT/COMPLETED) to AniList for all
linked series that changed since last sync, or have new books/no sync yet.

- Migration 0057: adds reading_status_push to index_jobs type constraint
- Migration 0058: creates reading_status_push_results table (pushed/skipped/no_books/error)
- API: new reading_status_push module with start_push, get_push_report, get_push_results
- Differential detection: synced_at IS NULL OR reading progress updated OR new books added
- Same 429 retry logic as reading_status_match (wait 10s, retry once, abort on 2nd 429)
- Notifications: ReadingStatusPushCompleted/Failed events
- Backoffice: push button in reading status group, job detail report with per-series list
- Replay support, badge label, i18n (FR + EN)

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

apps/backoffice/app/components/ui/Badge.tsx

@@ -118,6 +118,7 @@ export function JobTypeBadge({ type, className = "" }: JobTypeBadgeProps) {
     metadata_batch: t("jobType.metadata_batch"),
     metadata_refresh: t("jobType.metadata_refresh"),
     reading_status_match: t("jobType.reading_status_match"),
+    reading_status_push: t("jobType.reading_status_push"),
   };
   const label = jobTypeLabels[key] ?? type;
   return <Badge variant={variant} className={className}>{label}</Badge>;