feat(backup): GFS 分层保留策略（祖父-父-子）+ 任务表单配置#85
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新增企业级 GFS 保留：按天/周/月/年分层，每个周期保留最新一份，各层级取并集。 任一层级 > 0 即启用 GFS，取代 RetentionDays/MaxBackups 简单策略；全为 0 维持原 策略（向后兼容）。保留锁定（法律保留）记录始终豁免。 - model.BackupTask +KeepDaily/Weekly/Monthly/Yearly（AutoMigrate 自动加列，默认 0）。 - retention：gfsEnabled + selectGFSToDelete（按时间降序分桶、每桶留最新、层级并集、 排除锁定）；Cleanup 按是否启用 GFS 分流。 - 任务创建/更新输入、写入与摘要输出贯通四个字段。 - 测试：日层级仅留当日代表且只留最近 N 天、层级并集（月度救回日度会删的旧备份）、 锁定豁免、gfsEnabled 判定。
备份任务表单的保留区新增 GFS 配置（日/周/月/年四个数字输入，任一 > 0 即启用， 覆盖天数/份数）；types、draft 默认值、初值回填与提交载荷贯通 keepDaily/keepWeekly/keepMonthly/keepYearly。
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背景（丰富核心备份功能）
继保留锁定（#84）之后，补上备份产品的旗舰级保留策略 GFS（grandfather-father-son）：按天/周/月/年分层保留，兼顾近期细粒度与长期低频留存——企业备份的标准能力。
行为
RetentionDays/MaxBackups简单策略；全为 0 维持原策略（向后兼容，既有任务零影响）。后端
model.BackupTask+KeepDaily/Weekly/Monthly/Yearly（AutoMigrate 自动加列，默认 0）。retention：gfsEnabled+selectGFSToDelete（按时间降序分桶、每桶留最新、层级并集、排除锁定）；Cleanup按是否启用 GFS 分流。前端
测试
gfsEnabled判定。go test ./...全绿；前端tsc + vite build通过。