feat: Refine 2fa (#11766)

* wip

* Update 2fa.qrdialog.vue

* Update 2fa.vue

* Update CHANGELOG.md

* tweak

* ✌️

packages/backend/src/models/entities/UserProfile.ts

@@ -101,6 +101,11 @@ export class MiUserProfile {
 	})
 	public twoFactorSecret: string | null;
 
+	@Column('varchar', {
+		nullable: true, array: true,
+	})
+	public twoFactorBackupSecret: string[] | null;
+
 	@Column('boolean', {
 		default: false,
 	})