feat: support SiliconFlow (close #437, close #403)

common/constants.go

@@ -213,6 +213,7 @@ const (
 	ChannelTypeDify           = 37
 	ChannelTypeJina           = 38
 	ChannelCloudflare         = 39
+	ChannelTypeSiliconFlow    = 40
 
 	ChannelTypeDummy // this one is only for count, do not add any channel after this
 
@@ -259,4 +260,5 @@ var ChannelBaseURLs = []string{
 	"",                                          //37
 	"https://api.jina.ai",                       //38
 	"https://api.cloudflare.com",                //39
+	"https://api.siliconflow.cn",                //40
 }