feat(spec58): 审批人解析组件 ReviewerResolver 与发起接线

- 新增 ReviewerResolver：USER:<userId> / COLLEGE_ROLE:<roleCode>，; 分隔多段取并集升序
- reviewer_rule 为空回退 review_user_id；按学院解析空集合抛 BusinessException，消息含学院名/层级/缺什么
- ReviewFlowStarterService 发起与驳回重提改由解析取人，解析为空不写任何节点
- ReviewFlow 增加 reviewerRule 字段；DeclareRecordMapper 增加 selectReviewContext（仅 4 张在跑表）

src/main/java/com/gxwebsoft/gxmu/mapper/DeclareRecordMapper.java

@@ -48,6 +48,11 @@ public interface DeclareRecordMapper {
             + "FROM ${table} WHERE id = #{id} AND deleted = 0")
     Map<String, Object> selectRecord(@Param("table") String table, @Param("id") Integer id);
 
+    /** 审批人解析用：申报记录的申报人与学院标识（仅 4 张有 college_id 的在跑表可用） */
+    @Select("SELECT id AS id, user_id AS userId, college_id AS collegeId "
+            + "FROM ${table} WHERE id = #{id} AND deleted = 0")
+    Map<String, Object> selectReviewContext(@Param("table") String table, @Param("id") Integer id);
+
     /** 同项目下其他有效申报的负责人手机号与团队成员，用于团队重复校验 */
     @Select("SELECT id AS id, phone AS phone, team_members AS teamMembers FROM gxmu_tzbcy_form "
             + "WHERE declare_id = #{declareId} AND declare_status IN (1, 2, 3) AND deleted = 0 "