Add ASIN support to file organization and metadata

This update enhances audiobook file organization by including the ASIN in folder names and embedding it as a custom metadata tag in audio files (M4B/M4A/MP3). Documentation is updated to reflect the new folder naming convention and metadata tagging. Additionally, local login and registration can now be disabled via an environment variable, and the interactive torrent search modal allows custom search titles for all modes.

src/lib/utils/file-organizer.ts

@@ -16,6 +16,7 @@ export interface AudiobookMetadata {
   narrator?: string;
   year?: number;
   coverArtUrl?: string;
+  asin?: string;
 }
 
 export interface OrganizationResult {
@@ -110,6 +111,7 @@ export class FileOrganizer {
               author: audiobook.author,
               narrator: audiobook.narrator,
               year: audiobook.year,
+              asin: audiobook.asin,
             });
 
             const successCount = taggingResults.filter((r) => r.success).length;
@@ -153,7 +155,8 @@ export class FileOrganizer {
         this.mediaDir,
         audiobook.author,
         audiobook.title,
-        audiobook.year
+        audiobook.year,
+        audiobook.asin
       );
 
       await logger?.info(`Target path: ${targetPath}`);
@@ -359,16 +362,28 @@ export class FileOrganizer {
 
   /**
    * Build target path with sanitized names
+   * Format: Author/Title (Year) ASIN or Author/Title ASIN or Author/Title (Year)
    */
   private buildTargetPath(
     baseDir: string,
     author: string,
     title: string,
-    year?: number
+    year?: number,
+    asin?: string
   ): string {
     const authorClean = this.sanitizePath(author);
     const titleClean = this.sanitizePath(title);
-    const folderName = year ? `${titleClean} (${year})` : titleClean;
+
+    // Build folder name with optional year and ASIN
+    let folderName = titleClean;
+
+    if (year) {
+      folderName = `${folderName} (${year})`;
+    }
+
+    if (asin) {
+      folderName = `${folderName} ${asin}`;
+    }
 
     return path.join(baseDir, authorClean, folderName);
   }