feat(digital-human): 对口型生成弹窗增加计时器

- 对口型生成弹窗loading状态显示已用时（MM:SS格式，每秒更新）
- 使用useState+useEffect+setInterval实现计时，组件卸载时clearInterval防内存泄漏
- 取消生成或生成完成/失败时停止并重置计时器
- 样式与现有灰色提示文字风格一致

apps/web/src/pages/ai-avatar/AiAvatarPage.tsx

@@ -61,6 +61,9 @@ const AiAvatarPage: React.FC = () => {
     "generating",
   )
   const [lipsyncErrorMessage, setLipsyncErrorMessage] = useState("")
+  const [lipsyncElapsed, setLipsyncElapsed] = useState(0)
+  /* ── 对口型计时器 ── */
+  const lipsyncElapsedTimerRef = useRef<ReturnType<typeof setInterval> | null>(null)
   /* ── 渲染进度弹窗 ── */
   const [showRenderModal, setShowRenderModal] = useState(false)
   const [renderStatus, setRenderStatus] = useState<"generating" | "completed" | "failed">(
@@ -80,6 +83,30 @@ const AiAvatarPage: React.FC = () => {
   /* ── 渲染进度轮询 ── */
   const renderTimerRef = useRef<ReturnType<typeof setInterval> | null>(null)
 
+  /* ── 对口型计时器工具 ── */
+  const _formatElapsed = useCallback((seconds: number) => {
+    const m = Math.floor(seconds / 60)
+    const s = seconds % 60
+    return `${String(m).padStart(2, "0")}:${String(s).padStart(2, "0")}`
+  }, [])
+
+  const _startLipsyncElapsedTimer = useCallback(() => {
+    if (lipsyncElapsedTimerRef.current) {
+      clearInterval(lipsyncElapsedTimerRef.current)
+    }
+    setLipsyncElapsed(0)
+    lipsyncElapsedTimerRef.current = setInterval(() => {
+      setLipsyncElapsed((prev) => prev + 1)
+    }, 1000)
+  }, [])
+
+  const _stopLipsyncElapsedTimer = useCallback(() => {
+    if (lipsyncElapsedTimerRef.current) {
+      clearInterval(lipsyncElapsedTimerRef.current)
+      lipsyncElapsedTimerRef.current = null
+    }
+  }, [])
+
   const togglePanel = useCallback((key: PanelKey) => {
     setCollapsed((prev) => ({ ...prev, [key]: !prev[key] }))
   }, [])
@@ -222,6 +249,7 @@ const AiAvatarPage: React.FC = () => {
       setShowLipsyncModal(true)
       setLipsyncStatus("generating")
       setLipsyncErrorMessage("")
+      _startLipsyncElapsedTimer()
 
       const asset = await getAssetById(video.id)
       const videoUrl = asset?.file_url
@@ -265,6 +293,7 @@ const AiAvatarPage: React.FC = () => {
           state.setLipsyncJob(updated)
           if (updated.status === "completed") {
             if (lipsyncTimerRef.current) clearInterval(lipsyncTimerRef.current)
+            _stopLipsyncElapsedTimer()
             setLipsyncStatus("completed")
             setTimeout(() => {
               setShowLipsyncModal(false)
@@ -272,6 +301,7 @@ const AiAvatarPage: React.FC = () => {
             }, 1000)
           } else if (updated.status === "failed") {
             if (lipsyncTimerRef.current) clearInterval(lipsyncTimerRef.current)
+            _stopLipsyncElapsedTimer()
             setLipsyncStatus("failed")
             setLipsyncErrorMessage(updated.error_message || "对口型生成失败")
           }
@@ -285,6 +315,8 @@ const AiAvatarPage: React.FC = () => {
         data: (err as { response?: { data?: unknown } })?.response?.data,
         message: err instanceof Error ? err.message : String(err),
       })
+      _stopLipsyncElapsedTimer()
+      setLipsyncElapsed(0)
       setShowLipsyncModal(false)
       message.error(err instanceof Error ? err.message : "对口型任务提交失败，请重试")
     }
@@ -297,6 +329,8 @@ const AiAvatarPage: React.FC = () => {
 
     state.style,
     state.ttsPreview,
+    _startLipsyncElapsedTimer,
+    _stopLipsyncElapsedTimer,
   ])
 
   // 取消对口型生成
@@ -305,16 +339,19 @@ const AiAvatarPage: React.FC = () => {
       clearInterval(lipsyncTimerRef.current)
       lipsyncTimerRef.current = null
     }
+    _stopLipsyncElapsedTimer()
+    setLipsyncElapsed(0)
     setShowLipsyncModal(false)
     setLipsyncStatus("generating")
     setLipsyncErrorMessage("")
-  }, [])
+  }, [_stopLipsyncElapsedTimer])
 
   // 清理轮询
   useEffect(() => {
     return () => {
       if (lipsyncTimerRef.current) clearInterval(lipsyncTimerRef.current)
       if (renderTimerRef.current) clearInterval(renderTimerRef.current)
+      if (lipsyncElapsedTimerRef.current) clearInterval(lipsyncElapsedTimerRef.current)
     }
   }, [])
 
@@ -964,6 +1001,9 @@ const AiAvatarPage: React.FC = () => {
                     对口型视频生成中…
                   </div>
                   <div style={{ marginTop: 8, fontSize: 13, color: "#8c8ca1" }}>
+                    已用时：{_formatElapsed(lipsyncElapsed)}
+                  </div>
+                  <div style={{ marginTop: 4, fontSize: 13, color: "#8c8ca1" }}>
                     请勿关闭页面，完成后将自动提示
                   </div>
                 </>