fix: whisper model billing

- Refactor model name handling across multiple controllers to improve clarity and maintainability.
- Enhance error logging and handling for better debugging and request processing robustness.
- Update pricing models in accordance with new calculations, ensuring accuracy in the billing logic.

relay/meta/relay_meta.go

@@ -35,6 +35,20 @@ type Meta struct {
 	SystemPrompt    string
 }
 
+// GetMappedModelName returns the mapped model name and a bool indicating if the model name is mapped
+func GetMappedModelName(modelName string, mapping map[string]string) string {
+	if mapping == nil {
+		return modelName
+	}
+
+	mappedModelName := mapping[modelName]
+	if mappedModelName != "" {
+		return mappedModelName
+	}
+
+	return modelName
+}
+
 func GetByContext(c *gin.Context) *Meta {
 	if v, ok := c.Get(ctxkey.Meta); ok {
 		return v.(*Meta)
@@ -50,6 +64,7 @@ func GetByContext(c *gin.Context) *Meta {
 		Group:           c.GetString(ctxkey.Group),
 		ModelMapping:    c.GetStringMapString(ctxkey.ModelMapping),
 		OriginModelName: c.GetString(ctxkey.RequestModel),
+		ActualModelName: c.GetString(ctxkey.RequestModel),
 		BaseURL:         c.GetString(ctxkey.BaseURL),
 		APIKey:          strings.TrimPrefix(c.Request.Header.Get("Authorization"), "Bearer "),
 		RequestURLPath:  c.Request.URL.String(),
@@ -65,6 +80,8 @@ func GetByContext(c *gin.Context) *Meta {
 	}
 	meta.APIType = channeltype.ToAPIType(meta.ChannelType)
 
+	meta.ActualModelName = GetMappedModelName(meta.OriginModelName, meta.ModelMapping)
+
 	Set2Context(c, &meta)
 	return &meta
 }