feat(biz_project+meeting): 项目+会议软删除级联, admin/manager 双角色可删

biz_project* 5 表级联 (project/plan/assign/sponsor_assign/rating) + 会议链
biz_meeting* 6 表级联 admin-only → admin/manager 可删

DB:
- 5 ALTER TABLE 加 is_deleted TINYINT DEFAULT 0 NOT NULL (biz_project/plan/assign/sponsor_assign/rating)
- biz_meeting* 6 表已有 is_deleted 列 (上轮已 ALTER)

Domain (10 文件):
- 5 个 biz_project* 加 isDeleted 字段
- 6 个 biz_meeting* 加 isDeleted 字段
- (audit_log 列名特殊: 使用 deleted 字段存操作类型, 不冲突)

Mapper 接口 (10 文件):
- 5 个 project mapper 加 softDeleteByProjectId / softDeleteByProjectNo
- 5 个 meeting mapper 加 softDeleteByMeetingId
- BizMeetingMapper 加 selectIdListByProjectId (级联调用)

Mapper XML (10 文件):
- 所有 SELECT 加 is_deleted=0 过滤 (含 JOIN 子查询)
- 加 softDeleteByXxx UPDATE (10 处)
- BizMeetingMapper.xml 的 plan LEFT JOIN 加 proj.is_deleted=0 防悬挂

Service (3 文件):
- IBizProjectService.softDeleteCascade/Batch (含会议链调用)
- IBizMeetingService.softDeleteCascade/Batch
- BizProjectServiceImpl / BizMeetingServiceImpl @Transactional(rollbackFor=Exception.class)

Controller (2 文件):
- BizProjectController.DELETE 改 admin+manager 可删
- BizMeetingController.DELETE 改 admin+manager 可删 (放宽权限)

ry-api/ruoyi-business/src/main/resources/mapper/business/BizMeetingMaterialMapper.xml

@@ -12,21 +12,22 @@
         <result property="amount"        column="amount"         />
         <result property="creatorId"     column="creator_id"     />
         <result property="createTime"    column="create_time"    />
+        <result property="isDeleted"     column="is_deleted"     />
     </resultMap>
 
     <sql id="selectFields">
-        select id, meeting_id, material_type, sub_type, file_name, oss_url, amount, creator_id, create_time
+        select id, meeting_id, material_type, sub_type, file_name, oss_url, amount, creator_id, create_time, is_deleted
         from biz_meeting_material
     </sql>
 
     <select id="selectByPrimaryKey" resultMap="BizMeetingMaterialResult" parameterType="Long">
         <include refid="selectFields"/>
-        where id = #{id}
+        where id = #{id} and is_deleted = 0
     </select>
 
     <select id="selectByMeetingId" resultMap="BizMeetingMaterialResult" parameterType="Long">
         <include refid="selectFields"/>
-        where meeting_id = #{meetingId}
+        where meeting_id = #{meetingId} and is_deleted = 0
         order by id asc
     </select>
 
@@ -87,4 +88,9 @@
         delete from biz_meeting_material where meeting_id = #{meetingId}
     </delete>
 
+    <!-- 软删除: admin 删除会议时级联置 is_deleted=1 -->
+    <update id="softDeleteByMeetingId" parameterType="Long">
+        update biz_meeting_material set is_deleted = 1 where meeting_id = #{meetingId}
+    </update>
+
 </mapper>