fix(relay): wrong URL for claude model in GCP Vertex AI

relay/channel/vertex/adaptor.go

@@ -90,25 +90,35 @@ func (a *Adaptor) getRequestUrl(info *relaycommon.RelayInfo, modelName, suffix s
 		}
 		a.AccountCredentials = *adc
 
-		if a.RequestMode == RequestModeLlama {
+		if a.RequestMode == RequestModeGemini {
+			if region == "global" {
 				return fmt.Sprintf(
-				"https://%s-aiplatform.googleapis.com/v1beta1/projects/%s/locations/%s/endpoints/openapi/chat/completions",
+					"https://aiplatform.googleapis.com/v1/projects/%s/locations/global/publishers/google/models/%s:%s",
+					adc.ProjectID,
+					modelName,
+					suffix,
+				), nil
+			} else {
+				return fmt.Sprintf(
+					"https://%s-aiplatform.googleapis.com/v1/projects/%s/locations/%s/publishers/google/models/%s:%s",
 					region,
 					adc.ProjectID,
 					region,
+					modelName,
+					suffix,
 				), nil
 			}
-
+		} else if a.RequestMode == RequestModeClaude {
 			if region == "global" {
 				return fmt.Sprintf(
-				"https://aiplatform.googleapis.com/v1/projects/%s/locations/global/publishers/google/models/%s:%s",
+					"https://aiplatform.googleapis.com/v1/projects/%s/locations/global/publishers/anthropic/models/%s:%s",
 					adc.ProjectID,
 					modelName,
 					suffix,
 				), nil
 			} else {
 				return fmt.Sprintf(
-				"https://%s-aiplatform.googleapis.com/v1/projects/%s/locations/%s/publishers/google/models/%s:%s",
+					"https://%s-aiplatform.googleapis.com/v1/projects/%s/locations/%s/publishers/anthropic/models/%s:%s",
 					region,
 					adc.ProjectID,
 					region,
@@ -116,6 +126,14 @@ func (a *Adaptor) getRequestUrl(info *relaycommon.RelayInfo, modelName, suffix s
 					suffix,
 				), nil
 			}
+		} else if a.RequestMode == RequestModeLlama {
+			return fmt.Sprintf(
+				"https://%s-aiplatform.googleapis.com/v1beta1/projects/%s/locations/%s/endpoints/openapi/chat/completions",
+				region,
+				adc.ProjectID,
+				region,
+			), nil
+		}
 	} else {
 		if region == "global" {
 			return fmt.Sprintf(
@@ -134,6 +152,7 @@ func (a *Adaptor) getRequestUrl(info *relaycommon.RelayInfo, modelName, suffix s
 			), nil
 		}
 	}
+	return "", errors.New("unsupported request mode")
 }
 
 func (a *Adaptor) GetRequestURL(info *relaycommon.RelayInfo) (string, error) {