feat(backoffice): add reading progress management, series page, and live search

- API: add POST /series/mark-read to batch mark all books in a series
- API: add GET /series cross-library endpoint with search, library and status filters
- API: add library_id to SeriesItem response
- Backoffice: mark book as read/unread button on book detail page
- Backoffice: mark series as read/unread button on series cards
- Backoffice: new /series top-level page with search and filters
- Backoffice: new /libraries/[id]/series/[name] series detail page
- Backoffice: opacity on fully read books and series cards
- Backoffice: live search with debounce on books and series pages
- Backoffice: reading status filter on books and series pages
- Fix $2 -> $1 parameter binding in mark-series-read SQL

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

apps/api/src/main.rs

@@ -111,7 +111,9 @@ async fn main() -> anyhow::Result<()> {
         .route("/books/:id/pages/:n", get(pages::get_page))
         .route("/books/:id/progress", get(reading_progress::get_reading_progress).patch(reading_progress::update_reading_progress))
         .route("/libraries/:library_id/series", get(books::list_series))
+        .route("/series", get(books::list_all_series))
         .route("/series/ongoing", get(books::ongoing_series))
+        .route("/series/mark-read", axum::routing::post(reading_progress::mark_series_read))
         .route("/search", get(search::search_books))
         .route_layer(middleware::from_fn_with_state(state.clone(), api_middleware::read_rate_limit))
         .route_layer(middleware::from_fn_with_state(