diff --git a/apps/api/app/services/lipsync_service.py b/apps/api/app/services/lipsync_service.py
index 9fed8efd6..a24019fe3 100644
--- a/apps/api/app/services/lipsync_service.py
+++ b/apps/api/app/services/lipsync_service.py
@@ -189,7 +189,9 @@ class LipsyncService:
             audio_duration = probe_audio_duration(audio_data)
         if audio_duration <= 0 and supplied_duration and supplied_duration > 0:
             audio_duration = supplied_duration
-            logger.info("[lipsync] ffprobe 失败，使用前端传入的预合成时长: job_id=%s duration=%.2f", job.id, audio_duration)
+            logger.info(
+                "[lipsync] ffprobe 失败，使用前端传入的预合成时长: job_id=%s duration=%.2f", job.id, audio_duration
+            )
 
         # 3. 句子时间戳：优先用前端预合成传入的 timings（后端预合成接口已经算过，可信）；
         #    否则若音频下载成功则重算；否则不设置（不阻塞主流程）
@@ -274,7 +276,7 @@ class LipsyncService:
         """
         # 0. 输入校验
         is_pre_synth = bool(audio_url) and bool(sentence_timings)
-        is_direct_audio = bool(audio_url) and not is_pre_synth
+        bool(audio_url) and not is_pre_synth
         is_tts_mode = not bool(audio_url)
 
         if is_tts_mode:
diff --git a/apps/api/app/tasks/lipsync_tts.py b/apps/api/app/tasks/lipsync_tts.py
index ee78a2bab..2f75e9b41 100644
--- a/apps/api/app/tasks/lipsync_tts.py
+++ b/apps/api/app/tasks/lipsync_tts.py
@@ -26,11 +26,9 @@ from urllib.parse import urlparse
 from celery import shared_task
 
 # 复用共享的句子时间戳工具（#1845 配音前置）
+from packages.domain.sentence_timings import compute_sentence_timings as _compute_sentence_timings
 from packages.domain.sentence_timings import (
-    compute_sentence_timings as _compute_sentence_timings,
-    estimate_sentence_timings_by_chars as _estimate_sentence_timings_by_chars,
     probe_audio_duration,
-    split_script_into_sentences as _split_script_into_sentences,
 )
 
 logger = logging.getLogger(__name__)
diff --git a/apps/web/src/pages/ai-avatar/AiAvatarPage.tsx b/apps/web/src/pages/ai-avatar/AiAvatarPage.tsx
index 4d111f924..1e9fb4759 100644
--- a/apps/web/src/pages/ai-avatar/AiAvatarPage.tsx
+++ b/apps/web/src/pages/ai-avatar/AiAvatarPage.tsx
@@ -157,8 +157,8 @@ const AiAvatarPage: React.FC = () => {
     } catch (err) {
       _clearTtsProgressTimer()
       const errMsg =
-        (err as { response?: { data?: { message?: string; detail?: unknown } } })?.response?.data?.message ||
-        (err instanceof Error ? err.message : "配音合成失败，请重试")
+        (err as { response?: { data?: { message?: string; detail?: unknown } } })?.response?.data
+          ?.message || (err instanceof Error ? err.message : "配音合成失败，请重试")
       setTtsErrorMessage(typeof errMsg === "string" ? errMsg : "配音合成失败，请重试")
       state.setTtsPreview({
         audioUrl: null,
@@ -298,7 +298,14 @@ const AiAvatarPage: React.FC = () => {
       message.error(err instanceof Error ? err.message : "对口型任务提交失败，请重试")
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [state.selectedVideo, state.selectedVoice, state.scriptText, state.speed, state.emotion, state.ttsPreview])
+  }, [
+    state.selectedVideo,
+    state.selectedVoice,
+    state.scriptText,
+    state.speed,
+    state.emotion,
+    state.ttsPreview,
+  ])
 
   // 取消对口型生成
   const handleCancelLipsync = useCallback(() => {
@@ -744,7 +751,8 @@ const AiAvatarPage: React.FC = () => {
                     配音合成完成，点击下一步继续
                   </div>
                   <div style={{ marginTop: 8, fontSize: 13, color: "#8c8ca1" }}>
-                    音频时长 {state.ttsPreview.duration.toFixed(1)}s，共 {state.ttsPreview.sentenceTimings.length} 句
+                    音频时长 {state.ttsPreview.duration.toFixed(1)}s，共{" "}
+                    {state.ttsPreview.sentenceTimings.length} 句
                   </div>
                 </>
               )}
@@ -753,7 +761,15 @@ const AiAvatarPage: React.FC = () => {
                   <div style={{ fontSize: 48 }}>❌</div>
                   <div style={{ marginTop: 16, fontSize: 15, color: "#1a1a2e" }}>配音合成失败</div>
                   {ttsErrorMessage && (
-                    <div style={{ marginTop: 8, fontSize: 13, color: "#ff4d4f", textAlign: "center", padding: "0 20px" }}>
+                    <div
+                      style={{
+                        marginTop: 8,
+                        fontSize: 13,
+                        color: "#ff4d4f",
+                        textAlign: "center",
+                        padding: "0 20px",
+                      }}
+                    >
                       {ttsErrorMessage}
                     </div>
                   )}
diff --git a/tests/unit/test_lipsync_tts_preview.py b/tests/unit/test_lipsync_tts_preview.py
index 0dd13b9de..a3c97ca24 100644
--- a/tests/unit/test_lipsync_tts_preview.py
+++ b/tests/unit/test_lipsync_tts_preview.py
@@ -104,9 +104,10 @@ def test_preview_tts_success():
 
 def test_preview_tts_cosyvoice_error():
     """CosyVoice 抛错：应该包装成 MediaKitError 抛出。"""
-    from packages.application.cosyvoice_service import CosyVoiceError
     from app.services.mediakit_client import MediaKitError
 
+    from packages.application.cosyvoice_service import CosyVoiceError
+
     svc = _make_service(cosyvoice=CosyVoiceError("cosyvoice down"))
     try:
         with pytest.raises(MediaKitError):