给 vertexai 增加 Gemini 的 embedding 支持

relay/adaptor/vertexai/adaptor.go

@@ -62,10 +62,15 @@ func (a *Adaptor) GetChannelName() string {
 func (a *Adaptor) GetRequestURL(meta *meta.Meta) (string, error) {
 	suffix := ""
 	if strings.HasPrefix(meta.ActualModelName, "gemini") {
-		if meta.IsStream {
-			suffix = "streamGenerateContent?alt=sse"
-		} else {
-			suffix = "generateContent"
+		switch meta.Mode {
+		case relaymode.Embeddings:
+			suffix = "batchEmbedContents"
+		default:
+			if meta.IsStream {
+				suffix = "streamGenerateContent?alt=sse"
+			} else {
+				suffix = "generateContent"
+			}
 		}
 	} else {
 		if meta.IsStream {

relay/adaptor/vertexai/gemini/adapter.go

@@ -15,7 +15,7 @@ import (
 )
 
 var ModelList = []string{
-	"gemini-1.5-pro-001", "gemini-1.5-flash-001", "gemini-pro", "gemini-pro-vision",
+	"gemini-1.5-pro-001", "gemini-1.5-flash-001", "gemini-pro", "gemini-pro-vision","text-embedding-004"
 }
 
 type Adaptor struct {