feat(komga): add Komga read-status sync with reports and history

Adds Komga sync feature to import read status from a Komga server.
Books are matched by title (case-insensitive) with series+title primary
match and title-only fallback. Sync reports are persisted with matched,
newly marked, and unmatched book lists. UI shows check icon for newly
marked books, sorted to top. Credentials (URL+username) are saved
between sessions. Uses HashSet for O(1) lookups to handle large libraries.

Closes #2

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

apps/api/src/main.rs

@@ -3,6 +3,7 @@ mod books;
 mod error;
 mod handlers;
 mod index_jobs;
+mod komga;
 mod libraries;
 mod api_middleware;
 mod openapi;
@@ -100,6 +101,9 @@ async fn main() -> anyhow::Result<()> {
         .route("/admin/tokens", get(tokens::list_tokens).post(tokens::create_token))
         .route("/admin/tokens/:id", delete(tokens::revoke_token))
         .route("/admin/tokens/:id/delete", axum::routing::post(tokens::delete_token))
+        .route("/komga/sync", axum::routing::post(komga::sync_komga_read_books))
+        .route("/komga/reports", get(komga::list_sync_reports))
+        .route("/komga/reports/:id", get(komga::get_sync_report))
         .merge(settings::settings_routes())
         .route_layer(middleware::from_fn_with_state(
             state.clone(),