feat(task): add batch delete and cancel API support

支持批量删除和取消任务的接口：
- deleteTask 接口支持 POST 方式传入 ids 数组
- cancelTask 接口支持 POST 方式传入 ids 数组
- 前端批量操作改为调用批量接口，减少请求数量

Co-Authored-By: AI

web/src/task/data.ts

@@ -73,7 +73,27 @@ export const deleteTask = async (id: number) => {
     if (!res.success) throw new Error(res.message)
 }
 
+/** 批量删除任务 */
+export const deleteTasks = async (ids: number[]) => {
+    const res = await fetch('/api/deleteTask', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ ids })
+    }).then(res => res.json()) as ResJSON
+    if (!res.success) throw new Error(res.message)
+}
+
 export const cancelTask = async (id: number) => {
     const res = await fetch(`/api/cancelTask?id=${id}`).then(res => res.json()) as ResJSON
     if (!res.success) throw new Error(res.message)
+}
+
+/** 批量取消任务 */
+export const cancelTasks = async (ids: number[]) => {
+    const res = await fetch('/api/cancelTask', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ ids })
+    }).then(res => res.json()) as ResJSON
+    if (!res.success) throw new Error(res.message)
 }