add debug log

app.py

@@ -665,7 +665,7 @@ def generate_tts():
     # --- Cache Miss: Local File Cache ---
     # 对于预置文本和预置prompt，检查本地缓存
     if text in predefined_texts and prompt_md5 in predefined_prompts.values():
-        app.logger.warning(f"TTS Cache MISS for: '{text[:50]}...'. Generating on the fly.")
+        app.logger.warning(f"TTS Cache MISS for: '{text[:50]}...'. Finding in local cache.")
         available_models = Model.query.filter_by(
             model_type=ModelType.TTS, is_active=True
         ).all()
@@ -678,6 +678,7 @@ def generate_tts():
         invalid_models = []
         for model in candidate_models:
             audio_path = find_cached_audio(model.name, text, prompt_audio_path=reference_audio_path)
+            app.logger.warning(f"Checking cached audio for model {model.name}: {audio_path}")
             if audio_path and os.path.exists(audio_path):
                 valid_models.append(model)
             else: