feat: support cohere rerank

relay/constant/relay_mode.go

@@ -32,6 +32,7 @@ const (
 	RelayModeSunoFetch
 	RelayModeSunoFetchByID
 	RelayModeSunoSubmit
+	RelayModeRerank
 )
 
 func Path2RelayMode(path string) int {
@@ -56,6 +57,8 @@ func Path2RelayMode(path string) int {
 		relayMode = RelayModeAudioTranscription
 	} else if strings.HasPrefix(path, "/v1/audio/translations") {
 		relayMode = RelayModeAudioTranslation
+	} else if strings.HasPrefix(path, "/v1/rerank") {
+		relayMode = RelayModeRerank
 	}
 	return relayMode
 }