feat(achievement): 添加成就 API 层与类型，修复 WebSocket 消息分流

src/oj/achievement/api.ts

@@ -0,0 +1,27 @@
+import http from "utils/http"
+import type {
+  Achievement,
+  AchievementSummary,
+  PendingAchievement,
+} from "utils/types"
+
+export function getAchievements(name?: string) {
+  return http.get<{ username: string; achievements: Achievement[] }>(
+    "achievements",
+    { params: name ? { name } : {} },
+  )
+}
+
+export function getAchievementSummary(name?: string) {
+  return http.get<AchievementSummary>("achievements/summary", {
+    params: name ? { name } : {},
+  })
+}
+
+export function getPendingAchievements() {
+  return http.get<PendingAchievement[]>("achievements/pending")
+}
+
+export function markAchievementsRead(ids: number[]) {
+  return http.post("achievements/pending", { ids })
+}