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.

documentation/settings-pages.md

@@ -90,6 +90,7 @@ src/app/admin/settings/
 
 3. **General Settings Section** (visible when any source enabled)
    - Preferred format: EPUB (recommended), PDF, MOBI, AZW3, Any
+   - Auto-grab toggle: Automatically create ebook requests after audiobook downloads
 
 **Configuration Keys:**
 | Key | Default | Description |
@@ -97,6 +98,7 @@ src/app/admin/settings/
 | `ebook_annas_archive_enabled` | `false` | Enable Anna's Archive |
 | `ebook_indexer_search_enabled` | `false` | Enable Indexer Search via Prowlarr |
 | `ebook_sidecar_preferred_format` | `epub` | Preferred format |
+| `ebook_auto_grab_enabled` | `true` | Auto-create ebook requests after audiobook downloads |
 | `ebook_sidecar_base_url` | `https://annas-archive.li` | Anna's Archive mirror |
 | `ebook_sidecar_flaresolverr_url` | `` | FlareSolverr URL |
 
@@ -104,6 +106,7 @@ src/app/admin/settings/
 - If Anna's Archive enabled → Searches Anna's Archive first
 - If Indexer Search enabled → Falls back to indexer search if Anna's Archive fails/disabled
 - If both disabled → Ebook downloads completely off
+- If auto-grab disabled → Manual "Fetch Ebook" button only (admin buttons still work)
 
 ## Indexer Categories (Tabbed)