fix: add checks to return None if STT or TTS providers are disabled in config (#7363)

Co-authored-by: machina <1531829828@qq.com>

Author: machinad

astrbot/core/provider/manager.py

@@ -244,6 +244,8 @@ def get_using_provider(
                     provider = self.provider_insts[0] if self.provider_insts else None
             elif provider_type == ProviderType.SPEECH_TO_TEXT:
                 provider_id = config["provider_stt_settings"].get("provider_id")
+                if not config["provider_stt_settings"].get("enable"):
+                    return None
                 if not provider_id:
                     return None
                 provider = self.inst_map.get(provider_id)
@@ -253,6 +255,8 @@ def get_using_provider(
                     )
             elif provider_type == ProviderType.TEXT_TO_SPEECH:
                 provider_id = config["provider_tts_settings"].get("provider_id")
+                if not config["provider_tts_settings"].get("enable"):
+                    return None
                 if not provider_id:
                     return None
                 provider = self.inst_map.get(provider_id)