feat(idempotent): 新增幂等模块

实现内存/redis 模式幂等（默认内存模式）

continew-starter-idempotent/src/main/java/top/continew/starter/idempotent/annotation/Idempotent.java

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+ * <p>
+ * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE 3.0;
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * <p>
+ * http://www.gnu.org/licenses/lgpl.html
+ * <p>
+ * 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 top.continew.starter.idempotent.annotation;
+
+import java.lang.annotation.*;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * 定义幂等注解
+ *
+ * @version 1.0
+ * @Author loach
+ * @Date 2025-03-07 19:26
+ * @Package top.continew.starter.idempotent.annotation.Idempotent
+ */
+@Target({ElementType.METHOD})
+@Retention(RetentionPolicy.RUNTIME)
+@Documented
+public @interface Idempotent {
+
+    // 幂等key前缀
+    String prefix() default "idempotent:";
+
+    // key的过期时间
+    long timeout() default 0;
+
+    // 时间单位
+    TimeUnit timeUnit() default TimeUnit.SECONDS;
+
+    // 失败时的提示信息
+    String message() default "请勿重复操作";
+}