Fix duplicate identifier: rename externalServiceId to foreignId

- Rename to avoid collision with existing externalServiceId column
- Update all references in MediaRequest entity

server/entity/Media.ts

@@ -100,10 +100,10 @@ class Media {
 
   @Column({ nullable: true })
   @Index()
-  public externalServiceId?: string;
+  public foreignId?: string;
 
   @Column({ nullable: true })
-  public externalServiceTitle?: string;
+  public foreignTitle?: string;
 
   @Column({ type: 'int', default: MediaStatus.UNKNOWN })
   @Index()