Add music/book request flow support

- Add permission checks for music/book in MediaRequest.request()
- Add quota checks for music/book types
- Add externalServiceId and externalServiceTitle columns to Media entity
- Add foreignId/foreignTitle to MediaRequestBody interface
- Add requestMusicOrBook() method for simplified music/book requests
- Make TMDB lookup conditional (skip for music/book)
- Update request route filtering for music/book types
- Handle duplicate detection for foreign ID based media

server/entity/Media.ts

@@ -98,6 +98,13 @@ class Media {
   @Index()
   public imdbId?: string;
 
+  @Column({ nullable: true })
+  @Index()
+  public externalServiceId?: string;
+
+  @Column({ nullable: true })
+  public externalServiceTitle?: string;
+
   @Column({ type: 'int', default: MediaStatus.UNKNOWN })
   @Index()
   public status: MediaStatus;