feat(relay): Add Xinference channel support

common/constants.go

@@ -235,6 +235,7 @@ const (
 	ChannelTypeMokaAI         = 44
 	ChannelTypeVolcEngine     = 45
 	ChannelTypeBaiduV2        = 46
+	ChannelTypeXinference     = 47
 	ChannelTypeDummy          // this one is only for count, do not add any channel after this
 
 )
@@ -287,4 +288,5 @@ var ChannelBaseURLs = []string{
 	"https://api.moka.ai",                       //44
 	"https://ark.cn-beijing.volces.com",         //45
 	"https://qianfan.baidubce.com",              //46
+	"",                                          //47
 }