enhance(frontend): URL入力フォームのtypeをurlに

Resolve #12137

packages/frontend/src/pages/admin/settings.vue

@@ -34,7 +34,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 						</MkInput>
 					</FormSplit>
 
-					<MkInput v-model="impressumUrl">
+					<MkInput v-model="impressumUrl" type="url">
 						<template #label>{{ i18n.ts.impressumUrl }}</template>
 						<template #prefix><i class="ti ti-link"></i></template>
 						<template #caption>{{ i18n.ts.impressumDescription }}</template>