Propagate and use customSearchTerms for ebooks

Persist and apply customSearchTerms across ebook workflows and searches. Updated admin search-terms PATCH to enqueue addSearchEbookJob for ebook requests. Included customSearchTerms when creating ebook request records in audiobooks/[asin]/fetch-ebook, audiobooks/[asin]/select-ebook and requests/[id]/fetch-ebook. Reworked requests/[id]/select-ebook to handle being passed either an audiobook or ebook request (resolve parent audiobook, reuse existing ebook request if present) and to propagate parent.customSearchTerms when creating new ebook requests. Modified search-ebook.processor to read customSearchTerms from the request record, use it as the effective search title (with logging), and pass the modified audiobook title into Anna's Archive and indexer searches so custom terms are honored.

src/app/api/admin/requests/[id]/search-terms/route.ts

@@ -100,15 +100,21 @@ export async function PATCH(
             },
           });
 
-          // Queue search job
+          // Queue search job based on request type
           const { getJobQueueService } = await import('@/lib/services/job-queue.service');
           const jobQueue = getJobQueueService();
-          await jobQueue.addSearchJob(id, {
+          const audiobookData = {
             id: existingRequest.audiobook.id,
             title: existingRequest.audiobook.title,
             author: existingRequest.audiobook.author,
             asin: existingRequest.audiobook.audibleAsin || undefined,
-          });
+          };
+
+          if (existingRequest.type === 'ebook') {
+            await jobQueue.addSearchEbookJob(id, audiobookData);
+          } else {
+            await jobQueue.addSearchJob(id, audiobookData);
+          }
 
           searchTriggered = true;
           logger.info(`Search triggered for request ${id} with custom terms`, { requestId: id });