refactor(设置): 站点配置去掉从来没人读的网址、简称、页脚三项和 AI 小助手开关

库里 options 表那几行旧值留着，没有代码再读。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/api/src/services/options.ts

@@ -3,14 +3,10 @@ import { inArray } from "drizzle-orm"
 import { db, schema } from "../db"
 
 export const websiteOptionDefaults = {
-  website_base_url: "http://127.0.0.1",
   website_name: "Online Judge",
-  website_name_shortcut: "oj",
-  website_footer: "Online Judge Footer",
   allow_register: true,
   submission_list_show_all: true,
   class_list: [] as string[],
-  enable_maxkb: true,
 }
 
 export async function getOptions<const T extends readonly string[]>(keys: T) {