Archive the whole data volume in Backups, not just the database

Settings > Backups gains a whole-data archive beside the database
snapshots, and both lists now fully work from the page.

- Data archives: `write-data-backup-archive.ts` tars all of DATA_DIR into
  BACKUP_ARCHIVE_DIR as cobble-data-<epoch-ms>.tar.gz, every entry under one
  root folder named after the archive, writing a .part name and renaming on
  success so a cut-off run is never listed. The newest
  AppData.DataBackupsKept are kept; db/.backups is left as it is.
- Restore: `restore-data-backup.ts` extracts to a temp dir, requires one
  root folder holding a db folder, takes a safety archive first, then
  replaces DATA_DIR (the database snapshots included) and `restart-app.ts`
  restarts the process through the docker socket, since the open SQLite
  handle points at the replaced file.
- Upload and restore: a modal over each list (database file or data
  archive), replacing the old /admin/settings/backups/restore page.
- Delete for both kinds, icon-only row actions shared through
  RowIconButton, and restore on every row.
- One backup or restore of either kind at a time (with-backup-run-lock).
- BACKUP_ARCHIVE_DIR is a start-up path (ProcessOnlyEnvKeys); the installer
  mounts $COBBLE_HOME/backups-archives at /backups-archives and recreates a
  container that lacks it. The image installs tar and gzip.

src/types/index.ts

@@ -865,6 +865,17 @@ export type DbBackup = {
     size: number;
 };
 
+/**
+ * A tar.gz archive of the whole `DATA_DIR` in `BACKUP_ARCHIVE_DIR`
+ * (outside the data volume), newest first. Restoring one is an offline
+ * operation: the app only creates, lists and downloads them.
+ */
+export type DataBackup = {
+    name: string;
+    created_at: number;
+    size: number;
+};
+
 export type BotVoicePayload = {
     transcription: boolean;
     speech: boolean;
@@ -967,6 +978,7 @@ export type PagePropsType = {
     environment?: string;
     has_password?: boolean;
     backups?: DbBackup[] | null;
+    data_backups?: DataBackup[] | null;
     harness_overview?: HarnessOverviewPayload | null;
     bot_harness_overview?: BotHarnessOverviewPayload | null;
     envs_overview?: EnvsOverviewPayload | null;