feat: support specific default api version now (#57)

middleware/distributor.go

@@ -65,6 +65,9 @@ func Distribute() func(c *gin.Context) {
 		c.Request.Header.Set("Authorization", fmt.Sprintf("Bearer %s", channel.Key))
 		if channel.Type == common.ChannelTypeCustom || channel.Type == common.ChannelTypeAzure {
 			c.Set("base_url", channel.BaseURL)
+			if channel.Type == common.ChannelTypeAzure {
+				c.Set("api_version", channel.Other)
+			}
 		}
 		c.Next()
 	}