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/app/api/user/shelves/route.ts

@@ -42,6 +42,7 @@ export async function GET(request: NextRequest) {
           lastSyncAt: s.lastSyncAt,
           createdAt: s.createdAt,
           bookCount: s.bookCount ?? null,
+          autoRequest: s.autoRequest,
           books: processBooks(s.coverUrls),
         })),
         ...hardcover.map((s) => ({
@@ -52,6 +53,7 @@ export async function GET(request: NextRequest) {
           lastSyncAt: s.lastSyncAt,
           createdAt: s.createdAt,
           bookCount: s.bookCount ?? null,
+          autoRequest: s.autoRequest,
           books: processBooks(s.coverUrls),
         })),
       ].sort(