feat: add email recipient history to user settings and implement management in InboxDetailPage

paperless-backend/src/database/entities/user-settings.entity.ts

@@ -31,4 +31,7 @@ export class UserSettings {
 
   @Column({ type: 'int', nullable: true })
   DefaultLabelTemplateId!: number | null;
+
+  @Column({ type: 'json', nullable: true })
+  EmailRecipientHistory!: string[] | null;
 }