增加了修改，查看抽佣比例的功能

src/main/java/com/greenorange/promotion/config/RedisConfig.java

@@ -18,8 +18,13 @@ public class RedisConfig {
 
         // 指定kv的序列化方式
         Jackson2JsonRedisSerializer<Object> jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer<>(Object.class);
-        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
+        // 普通 KV 用 JSON 序列化 value，用字符串序列化 key
         redisTemplate.setKeySerializer(new StringRedisSerializer());
+        redisTemplate.setValueSerializer(jackson2JsonRedisSerializer);
+
+        // Hash 类型：hashKey 用字符串序列化，hashValue 也用字符串
+        redisTemplate.setHashKeySerializer(new StringRedisSerializer());
+        redisTemplate.setHashValueSerializer(new StringRedisSerializer());
 
         return redisTemplate;
     }