refactor(ui): 将复制功能从 ChatDrawer 移动到 ChatDrawerResult 组件

将复制到剪贴板的功能逻辑从 ChatDrawer 组件重构到 ChatDrawerResult 组件中，实现功能职责的合理分离。ChatDrawer 组件不再处理复制逻辑，相关的事件绑定和工具函数导入也已移除，使组件结构更加清晰。

frontend/app/web-gold/src/components/agents/ChatDrawer.vue

@@ -20,7 +20,6 @@ import {
   AlertDialogTitle
 } from '@/components/ui/alert-dialog'
 import { sendChatStream } from '@/api/agent'
-import { copyToClipboard } from '@/utils/clipboard'
 import HistoryPanel from './HistoryPanel.vue'
 import ChatDrawerHeader from './ChatDrawerHeader.vue'
 import ChatDrawerEmpty from './ChatDrawerEmpty.vue'
@@ -90,15 +89,6 @@ const handleGenerate = async () => {
   emit('send', { agentId: props.agent?.id, content: prompt, modelMode: modelMode.value })
 }
 
-const handleCopy = async () => {
-  const success = await copyToClipboard(generatedContent.value)
-  if (success) {
-    toast.success('已复制')
-  } else {
-    toast.error('复制失败')
-  }
-}
-
 const handleRegenerate = async () => {
   if (!currentInput.value || isGenerating.value) return
   generatedContent.value = ''
@@ -200,7 +190,6 @@ watch(() => props.visible, (val) => {
           :generated-content="generatedContent"
           :is-generating="isGenerating"
           @reset="handleReset"
-          @copy="handleCopy"
           @regenerate="handleRegenerate"
         />
       </div>

frontend/app/web-gold/src/components/agents/ChatDrawerResult.vue

@@ -1,9 +1,11 @@
 <script setup>
 import { ref, nextTick } from 'vue'
 import { Icon } from '@iconify/vue'
+import { toast } from 'vue-sonner'
 import { Button } from '@/components/ui/button'
 import { ScrollArea } from '@/components/ui/scroll-area'
 import Skeleton from '@/components/ui/skeleton/Skeleton.vue'
+import { copyToClipboard } from '@/utils/clipboard'
 
 const props = defineProps({
   currentInput: { type: String, default: '' },
@@ -11,12 +13,19 @@ const props = defineProps({
   isGenerating: { type: Boolean, default: false }
 })
 
-const emit = defineEmits(['reset', 'copy', 'regenerate'])
+const emit = defineEmits(['reset', 'regenerate'])
 
 const scrollAreaRef = ref(null)
 
 const handleReset = () => emit('reset')
-const handleCopy = () => emit('copy')
+const handleCopy = async () => {
+  const success = await copyToClipboard(props.generatedContent)
+  if (success) {
+    toast.success('已复制')
+  } else {
+    toast.error('复制失败')
+  }
+}
 const handleRegenerate = () => emit('regenerate')
 
 const scrollToBottom = () => {