fix(ui): remove duplicate function implementations in TaskCenter

scrollToBottom and handleScroll were defined twice (verbatim), causing TS2393 duplicate implementation errors now surfaced by vue-tsc 2.x.

frontend/src/views/task/TaskCenter.vue

@@ -240,31 +240,6 @@ function selectTask(taskId: string) {
   void loadLogs(taskId)
 }
 
-function scrollToBottom() {
-  if (!autoScroll.value) return
-
-  nextTick(() => {
-    if (logContainerRef.value) {
-      logContainerRef.value.scrollTop = logContainerRef.value.scrollHeight
-    }
-  })
-}
-
-function handleScroll() {
-  if (!logContainerRef.value) return
-
-  const { scrollTop, scrollHeight, clientHeight } = logContainerRef.value
-  const distanceFromBottom = scrollHeight - scrollTop - clientHeight
-
-  // 距离底部小于 50px 时认为在底部，恢复自动滚动
-  if (distanceFromBottom < 50) {
-    autoScroll.value = true
-  } else if (distanceFromBottom > 100) {
-    // 用户向上滚动超过 100px 时暂停自动滚动
-    autoScroll.value = false
-  }
-}
-
 function refreshCurrent() {
   void loadTasks()
 }