feat(declare): 同一申报项目进行中只允许一条申报

- 新增 DeclareGuardService：按已通过/未处理驳回/待审核数判重，申报项目行加锁防连点
- 9 张申报表补 declare_id / declare_status / declare_remark，提交时写入并随审核结果回写
- 新增撤回、作废（强制放行）接口；挑战杯团队成员按手机号判重
- 申报项目支持配置允许重复提交与最多同时条数
- 迁移脚本 sql/20261102_add_declare_uniqueness.sql（含存量回填与重复清单）

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

@@ -0,0 +1,65 @@
+package com.gxwebsoft.gxmu.mapper;
+
+import com.gxwebsoft.gxmu.entity.Declare;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
+import org.apache.ibatis.annotations.Update;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * 申报记录跨模块查询（同一申报项目的重复申报限制）
+ *
+ * <p>table 只接受 {@link com.gxwebsoft.gxmu.service.DeclareGuardService} 白名单里的模块名，
+ * 调用方不得把用户输入直接传进来。</p>
+ */
+@Mapper
+public interface DeclareRecordMapper {
+
+    /** 锁定申报项目行，串行化同一项目的并发提交 */
+    @Select("SELECT * FROM gxmu_declare WHERE id = #{id} AND deleted = 0 FOR UPDATE")
+    Declare lockDeclare(@Param("id") Integer id);
+
+    /** 某用户在某申报项目下、处于某状态的记录数 */
+    @Select("SELECT COUNT(*) FROM ${table} WHERE declare_id = #{declareId} AND user_id = #{userId} "
+            + "AND declare_status = #{status} AND deleted = 0")
+    int countByStatus(@Param("table") String table,
+                      @Param("declareId") Integer declareId,
+                      @Param("userId") Integer userId,
+                      @Param("status") Integer status);
+
+    /** 某用户在某申报项目下最近的一条记录 */
+    @Select("SELECT id AS id, declare_status AS declareStatus, create_time AS createTime, declare_remark AS declareRemark "
+            + "FROM ${table} WHERE declare_id = #{declareId} AND user_id = #{userId} AND deleted = 0 "
+            + "ORDER BY id DESC LIMIT 1")
+    Map<String, Object> selectLatestUserRecord(@Param("table") String table,
+                                               @Param("declareId") Integer declareId,
+                                               @Param("userId") Integer userId);
+
+    /** 某用户在某申报项目下的全部记录（申报项目列表回显本人状态用） */
+    @Select("SELECT id AS id, declare_id AS declareId, declare_status AS declareStatus, create_time AS createTime, "
+            + "declare_remark AS declareRemark FROM ${table} WHERE user_id = #{userId} AND deleted = 0 ORDER BY id DESC")
+    List<Map<String, Object>> selectUserRecords(@Param("table") String table, @Param("userId") Integer userId);
+
+    /** 单条记录（撤回 / 作废时校验归属） */
+    @Select("SELECT id AS id, user_id AS userId, declare_id AS declareId, declare_status AS declareStatus "
+            + "FROM ${table} WHERE id = #{id} AND deleted = 0")
+    Map<String, Object> selectRecord(@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 "
+            + "AND id <> #{excludeId}")
+    List<Map<String, Object>> selectTzbcyTeamPhones(@Param("declareId") Integer declareId,
+                                                    @Param("excludeId") Integer excludeId);
+
+    /** 更新申报记录状态（草稿 / 待审核 / 通过 / 驳回 / 作废） */
+    @Update("UPDATE ${table} SET declare_status = #{status}, declare_remark = #{remark}, update_time = NOW() "
+            + "WHERE id = #{id} AND deleted = 0")
+    int updateStatus(@Param("table") String table,
+                     @Param("id") Integer id,
+                     @Param("status") Integer status,
+                     @Param("remark") String remark);
+}