Enhance credential management and testing functionality

- Introduce new fields for voice, speed, and language in the AssistantConfig and ProviderCredential models to support TTS and ASR configurations.
- Update the database schema and seeding script to accommodate the new fields, ensuring backward compatibility.
- Implement credential testing endpoints and logic to validate OpenAI-compatible credentials, enhancing user experience and reliability.
- Modify frontend components to include new fields in the credential forms and improve connection testing feedback.
- Refactor related services and API interactions to support the new credential testing feature.

backend/services/pipecat/service_factory.py

@@ -11,6 +11,17 @@ from models import AssistantConfig
 from pipecat.services.openai.llm import OpenAILLMService
 from pipecat.services.openai.stt import OpenAISTTService
 from pipecat.services.openai.tts import OpenAITTSService
+from pipecat.transcriptions.language import Language
+
+
+def _language(value: str) -> Language | None:
+    if not value:
+        return None
+    try:
+        return Language(value)
+    except ValueError:
+        logger.warning(f"忽略不支持的 ASR language: {value}")
+        return None
 
 
 def create_stt(cfg: AssistantConfig):
@@ -22,6 +33,7 @@ def create_stt(cfg: AssistantConfig):
         api_key=cfg.stt_api_key or config.STT_API_KEY,
         base_url=cfg.stt_base_url or config.STT_BASE_URL,
         model=cfg.asr or config.STT_MODEL,
+        language=_language(cfg.stt_language),
     )
 
 
@@ -41,6 +53,7 @@ def create_tts(cfg: AssistantConfig):
         base_url=cfg.tts_base_url or config.TTS_BASE_URL,
         model=config.TTS_MODEL,
         voice=cfg.voice or config.TTS_VOICE,
+        speed=cfg.tts_speed,
     )