feat: manually mirror opencoze's code from bytedance

Change-Id: I09a73aadda978ad9511264a756b2ce51f5761adf

backend/crossdomain/contract/crossvariables/crossvaribales.go

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2025 coze-dev Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package crossvariables
+
+import (
+	"context"
+
+	"github.com/coze-dev/coze-studio/backend/api/model/crossdomain/variables"
+	"github.com/coze-dev/coze-studio/backend/api/model/kvmemory"
+)
+
+type Variables interface {
+	GetVariableInstance(ctx context.Context, e *variables.UserVariableMeta, keywords []string) ([]*kvmemory.KVItem, error)
+	SetVariableInstance(ctx context.Context, e *variables.UserVariableMeta, items []*kvmemory.KVItem) ([]string, error)
+	DecryptSysUUIDKey(ctx context.Context, encryptSysUUIDKey string) *variables.UserVariableMeta
+}
+
+var defaultSVC Variables
+
+func DefaultSVC() Variables {
+	return defaultSVC
+}
+
+func SetDefaultSVC(svc Variables) {
+	defaultSVC = svc
+}