Add interactive ebook search & selection

Introduce interactive ebook support: adds two API endpoints to search (interactive-search-ebook) and create/select ebook requests (select-ebook), plus server-side handlers to route Anna's Archive (direct) and indexer (torrent/NZB) downloads. Frontend: extend RequestActionsDropdown and InteractiveTorrentSearchModal to support an "ebook" search mode and selection flow, and add hooks (useInteractiveSearchEbook / useSelectEbook). Settings: add ebook_auto_grab_enabled with UI toggle and enforce disabling when no ebook sources are enabled; settings GET/PUT updated to persist the flag (default = true to preserve behavior). Documentation updated (scheduler, ebook-sidecar, settings pages) and ranking algorithm docs/tests extended to cover ebook-related normalization and matching cases. Includes logging and ranking integration for indexer results and normalization for Anna's Archive handling.

src/app/api/admin/settings/ebook/route.ts

@@ -14,7 +14,10 @@ export async function PUT(request: NextRequest) {
     return requireAdmin(req, async () => {
       try {
         // Parse request body - new structure with separate source toggles
-        const { annasArchiveEnabled, indexerSearchEnabled, format, baseUrl, flaresolverrUrl } = await request.json();
+        const { annasArchiveEnabled, indexerSearchEnabled, format, baseUrl, flaresolverrUrl, autoGrabEnabled } = await request.json();
+
+        // Enforce: auto-grab must be false if no sources are enabled
+        const effectiveAutoGrabEnabled = (annasArchiveEnabled || indexerSearchEnabled) ? (autoGrabEnabled ?? true) : false;
 
         // Validate format
         const validFormats = ['epub', 'pdf', 'mobi', 'azw3', 'any'];
@@ -66,6 +69,12 @@ export async function PUT(request: NextRequest) {
             category: 'ebook',
             description: 'Preferred e-book format',
           },
+          {
+            key: 'ebook_auto_grab_enabled',
+            value: effectiveAutoGrabEnabled ? 'true' : 'false',
+            category: 'ebook',
+            description: 'Automatically create ebook requests after audiobook downloads complete',
+          },
           // Anna's Archive specific settings
           {
             key: 'ebook_sidecar_base_url',