feat: 支持vertex ai渠道多个部署地区

relay/channel/vertex/relay-vertex.go

@@ -0,0 +1,16 @@
+package vertex
+
+import "one-api/common"
+
+func GetModelRegion(other string, localModelName string) string {
+	// if other is json string
+	if common.IsJsonStr(other) {
+		m := common.StrToMap(other)
+		if m[localModelName] != nil {
+			return m[localModelName].(string)
+		} else {
+			return m["default"].(string)
+		}
+	}
+	return other
+}