refactor: 重构模块依赖层级

sa-token-starter/sa-token-spring-boot4-starter/src/main/java/cn/dev33/satoken/Placeholder.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2020-2099 sa-token.cc
+ *
+ * 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 cn.dev33.satoken;
+
+
+/**
+ * 占位符
+ *
+ * @author click33
+ * @since 1.45.0
+ */
+public class Placeholder {
+
+}