feat(douyu): 二维码弹窗增加复制二维码/复制链接按钮

- 新增 QrActions 组件：复制二维码图片、复制二维码链接（含 execCommand 降级）
- 精英宝典绑定/电竞手册/支付三个弹窗统一功能按钮在上、操作按钮在下

web/frontend/src/pages/DouyuTasksPage.tsx

@@ -16,6 +16,7 @@ import {
   type DouyuTaskItem,
 } from '../api/modules';
 import ExchangeResultImage from '../components/ExchangeResultImage';
+import QrActions from '../components/QrActions';
 import { usePermissions } from '../hooks/usePermissions';
 import { useWebSocketLogs } from '../hooks/useWebSocketLogs';
 import {
@@ -279,6 +280,9 @@ export default function DouyuTasksPage({ handbook }: { handbook: HandbookKind })
   const [activeQrTaskId, setActiveQrTaskId] = useState<number | null>(null);
   const [esportsBindTask, setEsportsBindTask] = useState<DouyuTaskItem | null>(null);
   const [payTask, setPayTask] = useState<DouyuTaskItem | null>(null);
+  const qrCanvasWrapRef = useRef<HTMLDivElement | null>(null);
+  const esportsQrCanvasWrapRef = useRef<HTMLDivElement | null>(null);
+  const payQrCanvasWrapRef = useRef<HTMLDivElement | null>(null);
   const autoOpenedQrTaskIds = useRef<Set<number>>(new Set());
   const autoOpenedEsportsBindTaskIds = useRef<Set<number>>(new Set());
   const autoOpenedPayTaskIds = useRef<Set<number>>(new Set());
@@ -1608,13 +1612,16 @@ export default function DouyuTasksPage({ handbook }: { handbook: HandbookKind })
 
             {esportsQrUrl ? (
               <div style={{ textAlign: 'center' }}>
-                <QRCode value={esportsQrUrl} size={220} bordered={false} />
+                <div ref={esportsQrCanvasWrapRef}>
+                  <QRCode value={esportsQrUrl} size={220} bordered={false} />
+                </div>
                 <Text type="secondary" style={{ display: 'block', marginTop: 8 }}>
                   请在腾讯页面选择角色，完成后查询最新角色。
                 </Text>
               </div>
             ) : null}
 
+            <QrActions wrapRef={esportsQrCanvasWrapRef} url={esportsQrUrl} disabled={!esportsQrUrl} />
             <Space wrap>
               <Button
                 icon={<SearchOutlined />}
@@ -1693,7 +1700,9 @@ export default function DouyuTasksPage({ handbook }: { handbook: HandbookKind })
                 {qrStatusText}
               </Tag>
               {qrUrl ? (
-                <QRCode value={qrUrl} size={220} bordered={false} />
+                <div ref={qrCanvasWrapRef}>
+                  <QRCode value={qrUrl} size={220} bordered={false} />
+                </div>
               ) : qrBindReady ? (
                 <Text type="secondary">绑定二维码暂未返回</Text>
               ) : qrTask?.status === 'running' ? (
@@ -1701,6 +1710,7 @@ export default function DouyuTasksPage({ handbook }: { handbook: HandbookKind })
               ) : (
                 <Text type="secondary">本次未生成二维码</Text>
               )}
+              <QrActions wrapRef={qrCanvasWrapRef} url={qrUrl} disabled={!qrUrl} />
               {qrBindReady ? (
                 <>
                   <Tag color="gold" style={{ fontSize: 16, padding: '6px 16px' }}>
@@ -1774,10 +1784,13 @@ export default function DouyuTasksPage({ handbook }: { handbook: HandbookKind })
             )}
             <Space direction="vertical" align="center" size={12}>
               {payUrl ? (
-                <QRCode value={payUrl} size={220} bordered={false} />
+                <div ref={payQrCanvasWrapRef}>
+                  <QRCode value={payUrl} size={220} bordered={false} />
+                </div>
               ) : (
                 <Text type="secondary">支付码生成中...</Text>
               )}
+              <QrActions wrapRef={payQrCanvasWrapRef} url={payUrl} disabled={!payUrl} />
               <Text>{payTask.message || '请扫码支付'}</Text>
             </Space>
           </div>