Feat: サーバー初期設定ウィザード (#15954)

* wip

* wip

* Update welcome.setup.vue

* wip

* wip

* wip

* wip

* Update MkServerSetupWizard.vue

* Update MkServerSetupWizard.vue

* wip

* wip

* wip

* Update types.ts

* wip

* wip

* Update CHANGELOG.md

packages/backend/src/models/Meta.ts

@@ -675,6 +675,11 @@ export class MiMeta {
 		default: [],
 	})
 	public deliverSuspendedSoftware: SoftwareSuspension[];
+
+	@Column('boolean', {
+		default: false,
+	})
+	public singleUserMode: boolean;
 }
 
 export type SoftwareSuspension = {