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/api/src/main.rs

@@ -19,6 +19,7 @@ mod prowlarr;
 mod qbittorrent;
 mod reading_progress;
 mod reading_status_match;
+mod reading_status_push;
 mod search;
 mod series;
 mod settings;
@@ -149,6 +150,9 @@ async fn main() -> anyhow::Result<()> {
         .route("/reading-status/match", axum::routing::post(reading_status_match::start_match))
         .route("/reading-status/match/:id/report", get(reading_status_match::get_match_report))
         .route("/reading-status/match/:id/results", get(reading_status_match::get_match_results))
+        .route("/reading-status/push", axum::routing::post(reading_status_push::start_push))
+        .route("/reading-status/push/:id/report", get(reading_status_push::get_push_report))
+        .route("/reading-status/push/:id/results", get(reading_status_push::get_push_results))
         .merge(settings::settings_routes())
         .route_layer(middleware::from_fn_with_state(
             state.clone(),