fix(review): 代码审查 6 项修复（M2/M3/m1/m2/m3/m5）

集中修复 T8/T9/T11/T15 已实现代码的审查问题：
- M2 令牌桶 Lua 改用 Redis TIME（消除多节点时钟偏斜）
- M3 after 跨租户标记复查授权 + 无授权告警兜底
- m1 before 审计 MsgSeq/MsgRandom null 防御
- m2 HealthService 加 forceDown 开关，实测 DOWN 真返 503
- m3 countByStatus 排除 done（WHERE status IN (0,1,3)）
- m5 配额查询异常不缓存（下次重试）
- 附带 app.yml console charset GBK→UTF-8
M1 限流审计/事务收窄暂缓。

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

src/main/java/com/imutil/mapper/DistQueueMapper.java

@@ -84,6 +84,6 @@ public interface DistQueueMapper extends BaseMapper<DistQueue> {
      *
      * @return 每项含 status（0=pending/1=processing/2=done/3=dead）与 cnt
      */
-    @org.apache.ibatis.annotations.Select("SELECT status, count(*) AS cnt FROM dist_queue GROUP BY status")
+    @org.apache.ibatis.annotations.Select("SELECT status, count(*) AS cnt FROM dist_queue WHERE status IN (0, 1, 3) GROUP BY status")
     java.util.List<java.util.Map<String, Object>> countByStatus();
 }