feat: 更新配置文档

backend/internal/ai/stt/deepgram.go

@@ -16,17 +16,22 @@ import (
 // DeepgramService 基于 Deepgram WebSocket API 的语音识别实现。
 type DeepgramService struct {
 	apiKey   string
+	model    string
 	endpoint string
 	logger   *zap.SugaredLogger
 }
 
 // NewDeepgramService 创建 Deepgram STT 服务。
-func NewDeepgramService(apiKey, endpoint string, logger *zap.SugaredLogger) *DeepgramService {
+func NewDeepgramService(apiKey, model, endpoint string, logger *zap.SugaredLogger) *DeepgramService {
+	if model == "" {
+		model = "nova-2"
+	}
 	if endpoint == "" {
 		endpoint = "wss://api.deepgram.com/v1/listen"
 	}
 	return &DeepgramService{
 		apiKey:   apiKey,
+		model:    model,
 		endpoint: endpoint,
 		logger:   logger,
 	}
@@ -128,7 +133,7 @@ func (d *DeepgramService) buildURL(opts Options) string {
 	q.Set("encoding", encoding)
 	q.Set("sample_rate", fmt.Sprintf("%d", sampleRate))
 	q.Set("language", language)
-	q.Set("model", "nova-2")
+	q.Set("model", d.model)
 	q.Set("punctuate", "true")
 	u.RawQuery = q.Encode()