feat: refactor model manager

* chore: mv model icon
* fix: model icon
* fix: model icon
* feat: refactor model manager
* fix: model icon
* fix: model icon
* feat: refactor model manager

See merge request: !905

backend/crossdomain/contract/crossmodelmgr/cross_modelmgr.go

@@ -1,39 +0,0 @@
-/*
- * 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 crossmodelmgr
-
-import (
-	"context"
-
-	"github.com/coze-dev/coze-studio/backend/api/model/crossdomain/modelmgr"
-)
-
-type ModelMgr interface {
-	MGetModelByID(ctx context.Context, req *modelmgr.MGetModelRequest) ([]*modelmgr.Model, error)
-}
-
-type Model = modelmgr.Model
-
-var defaultSVC ModelMgr
-
-func DefaultSVC() ModelMgr {
-	return defaultSVC
-}
-
-func SetDefaultSVC(c ModelMgr) {
-	defaultSVC = c
-}