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/api/jobs/[id]/replay/route.ts

@@ -1,5 +1,5 @@
 import { NextRequest, NextResponse } from "next/server";
-import { apiFetch, IndexJobDto, rebuildIndex, rebuildThumbnails, regenerateThumbnails, startMetadataBatch, startMetadataRefresh, startReadingStatusMatch } from "@/lib/api";
+import { apiFetch, IndexJobDto, rebuildIndex, rebuildThumbnails, regenerateThumbnails, startMetadataBatch, startMetadataRefresh, startReadingStatusMatch, startReadingStatusPush } from "@/lib/api";
 
 export async function POST(
   _request: NextRequest,
@@ -32,6 +32,9 @@ export async function POST(
       case "reading_status_match":
         if (!libraryId) return NextResponse.json({ error: "Library ID required for reading status match" }, { status: 400 });
         return NextResponse.json(await startReadingStatusMatch(libraryId));
+      case "reading_status_push":
+        if (!libraryId) return NextResponse.json({ error: "Library ID required for reading status push" }, { status: 400 });
+        return NextResponse.json(await startReadingStatusPush(libraryId));
       default:
         return NextResponse.json({ error: `Cannot replay job type: ${job.type}` }, { status: 400 });
     }