feat: support cohere's web search

relay/adaptor/cohere/constant.go

@@ -5,3 +5,10 @@ var ModelList = []string{
 	"command-light", "command-light-nightly",
 	"command-r", "command-r-plus",
 }
+
+func init() {
+	num := len(ModelList)
+	for i := 0; i < num; i++ {
+		ModelList = append(ModelList, ModelList[i]+"-internet")
+	}
+}

relay/adaptor/cohere/main.go

@@ -17,6 +17,10 @@ import (
 	"github.com/songquanpeng/one-api/relay/model"
 )
 
+var (
+	WebSearchConnector = Connector{ID: "web-search"}
+)
+
 func stopReasonCohere2OpenAI(reason *string) string {
 	if reason == nil {
 		return ""
@@ -45,6 +49,10 @@ func ConvertRequest(textRequest model.GeneralOpenAIRequest) *Request {
 	if cohereRequest.Model == "" {
 		cohereRequest.Model = "command-r"
 	}
+	if strings.HasSuffix(cohereRequest.Model, "-internet") {
+		cohereRequest.Model = strings.TrimSuffix(cohereRequest.Model, "-internet")
+		cohereRequest.Connectors = append(cohereRequest.Connectors, WebSearchConnector)
+	}
 	for _, message := range textRequest.Messages {
 		if message.Role == "user" {
 			cohereRequest.Message = message.Content.(string)

relay/billing/ratio/model.go

@@ -228,6 +228,9 @@ func GetModelRatio(name string) float64 {
 	if strings.HasPrefix(name, "qwen-") && strings.HasSuffix(name, "-internet") {
 		name = strings.TrimSuffix(name, "-internet")
 	}
+	if strings.HasPrefix(name, "command-") && strings.HasSuffix(name, "-internet") {
+		name = strings.TrimSuffix(name, "-internet")
+	}
 	ratio, ok := ModelRatio[name]
 	if !ok {
 		ratio, ok = DefaultModelRatio[name]