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

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* wip

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* Update types.ts

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* wip

* Update CHANGELOG.md

packages/backend/src/server/api/endpoints/admin/update-meta.ts

@@ -196,6 +196,7 @@ export const paramDef = {
 				required: ['software', 'versionRange'],
 			},
 		},
+		singleUserMode: { type: 'boolean' },
 		ugcVisibilityForVisitor: {
 			type: 'string',
 			enum: ['all', 'local', 'none'],
@@ -694,6 +695,10 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				set.federationHosts = ps.federationHosts.filter(Boolean).map(x => x.toLowerCase());
 			}
 
+			if (ps.singleUserMode !== undefined) {
+				set.singleUserMode = ps.singleUserMode;
+			}
+
 			if (ps.ugcVisibilityForVisitor !== undefined) {
 				set.ugcVisibilityForVisitor = ps.ugcVisibilityForVisitor;
 			}