Add owner-only room backup snapshots and audited exports

drizzle/0018_admin_backup_downloads.sql

@@ -0,0 +1,9 @@
+CREATE TABLE `admin_room_backup_downloads` (
+  `download_id` text PRIMARY KEY NOT NULL,
+  `operation_id` text NOT NULL,
+  `actor_admin_id` text NOT NULL,
+  `room_code` text NOT NULL,
+  `created_at` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE INDEX `admin_room_backup_downloads_room` ON `admin_room_backup_downloads` (`room_code`,`created_at`);