style: 按 Oxfmt 重新格式化

换格式化器带来的差异，只有 5 个文件：长联合类型改成每项一行、以 | 开头。
和上一个提交分开，方便 blame 时跳过（git blame --ignore-rev）。

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

apps/web/src/oj/learn/composables/useExerciseParse.ts

@@ -1,7 +1,8 @@
 import type { Exercise } from "utils/types"
 
 export type Segment =
-  { type: "md"; content: string } | { type: "exercise"; exercise: Exercise }
+  | { type: "md"; content: string }
+  | { type: "exercise"; exercise: Exercise }
 
 export function parseExercises(
   content: string,

apps/web/src/oj/problem/components/SubmitFlowchart.vue

@@ -112,7 +112,8 @@ const POLL_INTERVAL = 3000
 const POLL_TIMEOUT = 3 * 60 * 1000
 
 type Outcome =
-  { ok: true; score: number; grade: string } | { ok: false; error?: string }
+  | { ok: true; score: number; grade: string }
+  | { ok: false; error?: string }
 
 const { pause: pausePolling, resume: resumePolling } = useIntervalFn(
   async () => {