fix: TTS朗读失败且刷新内容 — 安装edge-tts，前端改用blob播放代替downloadFile

backend/app/api/v1/translate.py

@@ -111,9 +111,7 @@ async def text_to_speech_get(
     if not audio:
         raise HTTPException(status_code=501, detail="TTS not available")
 
-    return Response(content=audio, media_type="audio/mpeg", headers={
-        "Content-Disposition": f'attachment; filename="tts-{lang}.mp3"',
-    })
+    return Response(content=audio, media_type="audio/mpeg")
 
 
 @router.post("/feedback")

backend/app/services/tts.py

@@ -28,7 +28,7 @@ SUPPORTED_LANGS = list(VOICE_MAP.keys())
 
 class TextToSpeechService:
     @staticmethod
-    async def synthesize(text: str, lang: str = "en", rate: str = "0%", pitch: str = "0Hz") -> Optional[bytes]:
+    async def synthesize(text: str, lang: str = "en", rate: str = "", pitch: str = "") -> Optional[bytes]:
         if not HAS_EDGE_TTS:
             logger.warning("edge-tts not available")
             return None
@@ -36,7 +36,10 @@ class TextToSpeechService:
         voice = VOICE_MAP.get(lang, VOICE_MAP["en"])
 
         try:
-            communicate = edge_tts.Communicate(text, voice, rate=rate, pitch=pitch)
+            kwargs = {"voice": voice, "rate": rate} if rate else {"voice": voice}
+            if pitch:
+                kwargs["pitch"] = pitch
+            communicate = edge_tts.Communicate(text, **kwargs)
             audio_data = b""
             async for chunk in communicate.stream():
                 if chunk["type"] == "audio":