fix(名字): 比赛成绩、全班情况、看板、题单、统计里的名字不再用真名，一律和排行榜一样显示 ks241XXX；导出成绩去掉姓名列

两个写法不同的 UserName 合成 shared/components/UserName.vue 一个。

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

apps/web/src/oj/submission/list.vue

@@ -29,7 +29,7 @@ import type {
 import { FlowchartSubmissionStatus } from "utils/types"
 import FlowchartState from "./components/FlowchartState.vue"
 import StatusPill from "./components/StatusPill.vue"
-import UserName from "./components/UserName.vue"
+import UserName from "shared/components/UserName.vue"
 import { useTone } from "./composables/tone"
 import { classLabel, classSelectOptions, submissionClockText, submissionDayText } from "./utils"