feat: Define types for contest and task pair (#2627)

Author: KATO-Hiro

src/lib/types/contest_task_pair.ts

@@ -1,5 +1,23 @@
 import type { ContestTaskPair as ContestTaskPairOrigin } from '@prisma/client';
 
+import type { TaskResult } from '$lib/types/task';
+
 export type ContestTaskPair = ContestTaskPairOrigin;
 
 export type ContestTaskPairs = ContestTaskPair[];
+
+// For CRUD operation parameter types
+export type ContestTaskPairCreate = {
+  contestId: string;
+  taskTableIndex: string;
+  taskId: string;
+};
+
+export type ContestTaskPairRead = ContestTaskPairCreate;
+
+export type ContestTaskPairUpdate = ContestTaskPairCreate;
+
+// For mapping and identification
+export type ContestTaskPairKey = `${string}:${string}`; // "contest_id:task_id"
+
+export type TaskResultMapByContestTaskPair = Map<ContestTaskPairKey, TaskResult>;