feat(mq-starter-idempotent-redis): 新建 driver 中立去重模块，迁入 RedisMqIdempotentStore 及其测试

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

mq-starter-idempotent-redis/src/test/java/com/njcn/mq/idempotent/redis/RedisMqIdempotentStoreIT.java

@@ -0,0 +1,38 @@
+package com.njcn.mq.idempotent.redis;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory;
+import org.springframework.data.redis.core.StringRedisTemplate;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+class RedisMqIdempotentStoreIT {
+
+    @Test
+    void stateMachine_firstAcquire_thenBlocked_failReopens_successBlocks() {
+        StringRedisTemplate redis = newRedisOrSkip();
+        RedisMqIdempotentStore store = new RedisMqIdempotentStore(redis, "mq:idem:it:", 60, 300, 300);
+        String key = "k_" + System.nanoTime();
+
+        assertTrue(store.tryAcquire(key), "首次应放行并占用 processing");
+        assertFalse(store.tryAcquire(key), "processing 中应挡回");
+
+        store.markFail(key);
+        assertTrue(store.tryAcquire(key), "上次 fail 后应允许重新消费");
+
+        store.markSuccess(key);
+        assertFalse(store.tryAcquire(key), "success 后应挡回，避免重复消费");
+    }
+
+    private static StringRedisTemplate newRedisOrSkip() {
+        try {
+            LettuceConnectionFactory cf = new LettuceConnectionFactory("localhost", 6379);
+            cf.afterPropertiesSet();
+            StringRedisTemplate t = new StringRedisTemplate(cf);
+            t.afterPropertiesSet();
+            t.hasKey("ping");
+            return t;
+        } catch (Exception e) { assumeTrue(false, "no local redis, skip"); return null; }
+    }
+}

mq-starter-idempotent-redis/src/test/java/com/njcn/mq/idempotent/redis/RedisMqIdempotentStoreTest.java

@@ -0,0 +1,34 @@
+package com.njcn.mq.idempotent.redis;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.data.redis.core.ValueOperations;
+
+import static org.junit.jupiter.api.Assertions.*;
+import static org.mockito.Mockito.*;
+
+/**
+ * {@link RedisMqIdempotentStore#isCompleted(String)} 纯单测(mock StringRedisTemplate，不依赖真实 Redis）。
+ *
+ * <p>isCompleted 必须仅在 key 值为 {@code success} 时返回 true：processing / 无记录 一律 false，
+ * 否则消费者崩溃后残留的 processing 标记会被 driver 当成"已完成"而 ACK，造成静默丢消息。
+ */
+class RedisMqIdempotentStoreTest {
+
+    @Test
+    void isCompleted_trueOnlyForSuccessValue() {
+        StringRedisTemplate redis = mock(StringRedisTemplate.class);
+        @SuppressWarnings("unchecked")
+        ValueOperations<String, String> ops = mock(ValueOperations.class);
+        when(redis.opsForValue()).thenReturn(ops);
+        RedisMqIdempotentStore store = new RedisMqIdempotentStore(redis, "mq:idem:", 60, 300, 300);
+
+        when(ops.get("mq:idem:kSucc")).thenReturn("success");
+        when(ops.get("mq:idem:kProc")).thenReturn("processing");
+        when(ops.get("mq:idem:kNone")).thenReturn(null);
+
+        assertTrue(store.isCompleted("kSucc"), "success 应视为已完成，driver 可 ACK");
+        assertFalse(store.isCompleted("kProc"), "processing 不可视为完成，否则崩溃残留会被 ACK 丢消息");
+        assertFalse(store.isCompleted("kNone"), "无记录(标记已过期)不可视为完成");
+    }
+}