feat: add endpoint type selection to channel testing functionality

common/endpoint_defaults.go

@@ -23,6 +23,7 @@ var defaultEndpointInfoMap = map[constant.EndpointType]EndpointInfo{
 	constant.EndpointTypeGemini:          {Path: "/v1beta/models/{model}:generateContent", Method: "POST"},
 	constant.EndpointTypeJinaRerank:      {Path: "/rerank", Method: "POST"},
 	constant.EndpointTypeImageGeneration: {Path: "/v1/images/generations", Method: "POST"},
+	constant.EndpointTypeEmbeddings:      {Path: "/v1/embeddings", Method: "POST"},
 }
 
 // GetDefaultEndpointInfo 返回指定端点类型的默认信息以及是否存在