enhance(server): add rate limits for some endpoints

packages/backend/src/server/api/endpoints/users/groups/create.ts

@@ -1,4 +1,5 @@
 import { Inject, Injectable } from '@nestjs/common';
+import ms from 'ms';
 import type { UserGroupsRepository, UserGroupJoiningsRepository } from '@/models/index.js';
 import { IdService } from '@/core/IdService.js';
 import type { UserGroup } from '@/models/entities/UserGroup.js';
@@ -16,6 +17,11 @@ export const meta = {
 
 	description: 'Create a new group.',
 
+	limit: {
+		duration: ms('1hour'),
+		max: 10,
+	},
+
 	res: {
 		type: 'object',
 		optional: false, nullable: false,