Add skip-unreleased auto-search feature

Introduce an indexer-wide option to skip automatic searches for books with future release dates (config key: `indexer.skip_unreleased`, default ON). Adds a GET/PUT admin API for indexer options, a UI toggle on the Indexers settings tab (persisted on save), and persistence of a request-level releaseDate in the Prisma schema.

Adds a new request status `awaiting_release` and wires it through constants, UI components (StatusBadge, RequestCard, RecentRequestsTable, Audiobook card/modal, RequestActions), API request flows (bookdate swipe, request creation, manual search, request PATCHs, request listing groups), and services. Implements a pure release-date utility (isUnreleased / shouldSkipAutoSearch) and updates background processors: monitor-rss-feeds (skip matches but do not mutate status), retry-missing-torrents (drives bidirectional transitions between awaiting_search and awaiting_release and queues searches when appropriate), and request-creator/bookdate swipe (gate initial auto-search). Adds tests for the swipe gate and other related test updates. Logs transitions and gate decisions for observability.

src/app/api/requests/[id]/route.ts

@@ -182,7 +182,7 @@ export async function PATCH(
       } else if (action === 'retry') {
         // Retry failed request - allow users to retry their own warn/failed requests
         // Only allow retry for failed, warn, or awaiting_* statuses
-        const retryableStatuses = ['failed', 'warn', 'awaiting_search', 'awaiting_import'];
+        const retryableStatuses = ['failed', 'warn', 'awaiting_search', 'awaiting_import', 'awaiting_release'];
 
         if (!retryableStatuses.includes(requestRecord.status)) {
           return NextResponse.json(