feat: make possible to delete an account by admin

Resolve #8830

packages/backend/src/server/api/endpoints/admin/delete-account.ts

@@ -0,0 +1,31 @@
+import { Users } from '@/models/index.js';
+import { deleteAccount } from '@/services/delete-account.js';
+import define from '../../define.js';
+
+export const meta = {
+	tags: ['admin'],
+
+	requireCredential: true,
+	requireAdmin: true,
+
+	res: {
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['userId'],
+} as const;
+
+// eslint-disable-next-line import/no-default-export
+export default define(meta, paramDef, async (ps) => {
+	const user = await Users.findOneByOrFail({ id: ps.userId });
+	if (user.isDeleted) {
+		return;
+	}
+
+	await deleteAccount(user);
+});