Implement chapter merging feature and update ranking algorithm

Added automatic chapter merging to M4B with admin/config toggles, UI controls, and backend logic. Updated documentation to reflect implementation. Refactored ranking algorithm: increased Title/Author match points, removed size scoring, and improved Usenet/torrent handling. Enhanced Prowlarr integration for protocol detection and filtering. Improved file organizer to support chapter merging. Various bug fixes and logging improvements.

src/lib/integrations/sabnzbd.service.ts

@@ -267,6 +267,8 @@ export class SABnzbdService {
    * Returns the NZB ID
    */
   async addNZB(url: string, options?: AddNZBOptions): Promise<string> {
+    console.log(`[SABnzbd] Adding NZB from URL: ${url.substring(0, 150)}...`);
+
     const response = await this.client.get('/api', {
       params: {
         mode: 'addurl',