Scheduled reports: Download, a report for a period as a ZIP

inbuxa:ReportExport/set creates {reportId, from?, to?}: the report built
for that period (its last full one by default, at most 90 days back, as
far as metrics are kept) as a ZIP of summary.txt and the section CSVs,
stored as an upload, mailing nobody. Reading needs sysScheduledReportGet,
as seeing the report does; a tenant administrator downloads only their
own; every download is in the audit log. A download doesn't move the
deliverability baseline the next mail compares with.

crates/jmap-proto/src/object/mod.rs

@@ -33,6 +33,7 @@ pub mod inbuxa_mail_rule; // inbuxa: DLP and mail flow rules
 pub mod inbuxa_security_acceptance; // inbuxa: accepted security to-do items
 pub mod inbuxa_deliverability_report; // inbuxa: the deliverability check
 pub mod inbuxa_deliverability_settings; // inbuxa: the deliverability check
+pub mod inbuxa_report_export; // inbuxa: scheduled reports, RP-19
 pub mod inbuxa_scheduled_report; // inbuxa: scheduled reports
 pub mod inbuxa_scheduled_report_settings; // inbuxa: scheduled reports
 pub mod inbuxa_journal; // inbuxa: journaling