feat: add vertex claude channel

common/constants.go

@@ -233,6 +233,7 @@ const (
 	ChannelTypeMiniMax        = 35
 	ChannelTypeScholarAI      = 36
 	ChannelTypeDoubao         = 37
+	ChannelTypeVertexClaude   = 38
 
 	ChannelTypeDummy // this one is only for count, do not add any channel after this
 )
@@ -276,4 +277,5 @@ var ChannelBaseURLs = []string{
 	"https://api.minimax.chat",                  //35
 	"https://api.scholarai.io",                  //36
 	"https://ark.cn-beijing.volces.com",         //37
+	"",                                          //38
 }