add message history

src/api.ts

@@ -6,6 +6,7 @@ import type {
   FlagType,
   SubmissionOut,
   PromptMessage,
+  PromptHistoryItem,
   TaskStatsOut,
   TaskAsset,
   AwardSection,
@@ -306,6 +307,11 @@ export const Prompt = {
     return (await http.get("/prompt/conversations/", { params })).data
   },
 
+  async listHistory(taskId: number): Promise<PromptHistoryItem[]> {
+    const res = await http.get(`/prompt/history/${taskId}`)
+    return res.data
+  },
+
   async getMessages(conversationId: string): Promise<PromptMessage[]> {
     return (
       await http.get<PromptMessage[]>(