refactor: 重构模块依赖层级

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

@@ -14,7 +14,15 @@
  * limitations under the License.
  */
 
-/**
- * Sa-Token 集成 Reactor 响应式编程 (SpringBoot 4.x)
- */
 package cn.dev33.satoken.reactor;
+
+
+/**
+ * 占位符
+ *
+ * @author click33
+ * @since 1.45.0
+ */
+public class Placeholder {
+
+}