refactor: 优化字典管理相关 API

1.合并 DictResp 及 DictDetailResp
2.合并 DictItemResp 及 DictItemDetailResp
3.字典项增加状态 status 字段

continew-admin-common/src/main/java/top/charles7c/continew/admin/common/constant/CacheConstants.java

@@ -56,11 +56,6 @@ public class CacheConstants {
      */
     public static final String MENU_KEY_PREFIX = "MENU" + DELIMITER;
 
-    /**
-     * 字典缓存键前缀
-     */
-    public static final String DICT_KEY_PREFIX = "DICT" + DELIMITER;
-
     /**
      * 参数缓存键前缀
      */