fix(fishspeech): 修复获取语音文件异常处理

- 在获取 speaker_audio_path 时增加异常捕获
- 如果发生 FileHandleException 异常，将异常信息抛出为 APIException

Author: Cvandia

nonebot_plugin_fishspeech_tts/fish_speech_api.py

@@ -46,7 +46,10 @@ async def generate_servettsrequest(
         """
 
         references = []
-        speaker_audio_path = get_speaker_audio_path(self.path_audio, speaker_name)
+        try:
+            speaker_audio_path = get_speaker_audio_path(self.path_audio, speaker_name)
+        except FileHandleException as e:
+            raise APIException(str(e))
         for audio in speaker_audio_path:
             audio_bytes = audio.read_bytes()
             ref_text = extract_text_by_filename(audio.name)