:feat: HCS附件转传映射落库，Redis缓存判重改为blade_hcs_attachment_sync持久化表

- 新增 HcsAttachmentSync 实体与 Mapper（biz_type+biz_id+attachment_key 唯一，照金蝶附件同步表设计，仅落成功记录）
- HcsAttachmentSupport 移除 BladeRedis 依赖，transferOne 查表命中即复用合规附件ID，未命中上传后落行
- transferAttachments/transferContractAttachments 增加 bizType/bizId 入参，六个调用点（合同主附件/特批说明/特批付款/履约记录/开票登记/收票单）传入业务上下文
- HcsSyncConstant 删除 ATTACHMENT_CACHE_KEY_PREFIX/ATTACHMENT_CACHE_TTL_DAYS 缓存常量
- 新增建表脚本 blade_hcs_attachment_sync_20261012.sql，技术设计文档 §6 映射缓存表述同步更新

blade-service/blade-transport/src/main/java/org/springblade/transport/mapper/HcsAttachmentSyncMapper.java

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+/**
+ * BladeX Commercial License Agreement
+ * Copyright (c) 2018-2099, https://bladex.cn. All rights reserved.
+ * <p>
+ * Use of this software is governed by the Commercial License Agreement
+ * obtained after purchasing a license from BladeX.
+ * <p>
+ * 1. This software is for development use only under a valid license
+ * from BladeX.
+ * <p>
+ * 2. Redistribution of this software's source code to any third party
+ * without a commercial license is strictly prohibited.
+ * <p>
+ * 3. Licensees may copyright their own code but cannot use segments
+ * from this software for such purposes. Copyright of this software
+ * remains with BladeX.
+ * <p>
+ * Using this software signifies agreement to this License, and the software
+ * must not be used for illegal purposes.
+ * <p>
+ * THIS SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY. The author is
+ * not liable for any claims arising from secondary or illegal development.
+ * <p>
+ * Author: Chill Zhuang (bladejava@qq.com)
+ */
+package org.springblade.transport.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import org.apache.ibatis.annotations.Mapper;
+import org.springblade.transport.pojo.entity.HcsAttachmentSync;
+
+/**
+ * HCS 附件转传映射 Mapper
+ *
+ * @author Chill
+ */
+@Mapper
+public interface HcsAttachmentSyncMapper extends BaseMapper<HcsAttachmentSync> {
+}