Add per-shelf autoRequest toggle

Introduce an autoRequest boolean on Goodreads and Hardcover shelves (default true) so users can pause/resume automatic request creation. Schema, API handlers, hooks and types were updated to accept and persist autoRequest when creating or updating shelves; add endpoints only trigger an immediate resync when the feed/token changes. The shelf sync core and service code now respect autoRequest (skipping request creation and annotating logs when disabled). UI updates include an AddShelf toggle, manage/update payload changes, shelf list props, and visual indicators + toggle actions in the shelf cards.

src/components/ui/ManageShelfModal.tsx

@@ -45,7 +45,7 @@ export function ManageShelfModal({ shelf, isOpen, onClose }: ManageShelfModalPro
     try {
       if (shelf.type === 'goodreads') {
         if (!rssUrl.trim()) return;
-        await updateGoodreads(shelf.id, rssUrl.trim());
+        await updateGoodreads(shelf.id, { rssUrl: rssUrl.trim() });
       } else {
         if (!listId.trim()) return;
         await updateHardcover(shelf.id, {