Fix TTS URL handling: convert relative URLs to absolute URLs in Live Stream service

Back-end/services/live_stream_service.py

@@ -199,6 +199,11 @@ async def tts_node(state: ChatState) -> ChatState:
                 audio_url = result.get("url")
                 if not audio_url:
                     raise RuntimeError("TTS no URL")
+                
+                # Construire l'URL complète si c'est une URL relative
+                if audio_url.startswith("/"):
+                    audio_url = f"http://localhost:5000{audio_url}"
+                
                 async with session.get(audio_url) as audio_resp:
                     if audio_resp.status != 200:
                         raise RuntimeError(f"TTS file fetch error {audio_resp.status}")