feat(audit): 审计日志保留期清理（后端自动清理 + 审计页配置）#83
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审计日志此前不限期增长。企业合规（数据生命周期管理）与存储治理需要可配置的 保留期 + 自动清理。 - AuditLogRepository.DeleteBefore：按 created_at 删除超期日志。 - AuditService.PurgeOlderThan + StartRetentionMonitor：每 6h 读取 audit_retention_days 设置并清理超期日志；0/缺省=永久保留（向后兼容，默认不删历史）。 - settings 新增 audit_retention_days 键（纳入 allow-list）。 - app.go 启动保留期后台监控。 - audit_retention_test 覆盖：DeleteBefore、PurgeOlderThan(<=0 不删/>0 删)、 设置驱动清理、0=永久保留。
审计日志页头新增管理员可见的「日志保留期」控件（天数输入，0=永久保留）+ 保存按钮， 写入 audit_retention_days 设置；后端每 6h 据此自动清理超期日志。
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背景
审计日志此前不限期增长。企业合规（数据生命周期管理，SOC2/ISO27001/等保）与存储治理都需要可配置的保留期 + 自动清理。
后端
AuditLogRepository.DeleteBefore(cutoff)：按created_at删除超期日志。AuditService.PurgeOlderThan(days)+StartRetentionMonitor：每 6h 读取audit_retention_days设置并清理超期日志；0/缺省 = 永久保留（向后兼容，默认不删任何历史）。audit_retention_days键（纳入显式 allow-list）；app.go启动后台监控。前端
0= 永久）+ 保存按钮，写入设置后由后端自动执行清理。测试
audit_retention_test：DeleteBefore/PurgeOlderThan(≤0 不删、>0 删) / 设置驱动清理 /0=永久保留。补齐fakeAuditRepo的新接口方法。go test ./...全绿；前端tsc + vite build通过。