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/pages/admin/settings/backups/(functions)/create-data-backup.ts

@@ -0,0 +1,21 @@
+import adminFetchHandler from "@/src/functions/frontend/admin-fetch-handler";
+
+export default async function createDataBackup() {
+    if (
+        !window.confirm(
+            `Archive all of the data volume now? It can take a while on a busy install.`,
+        )
+    ) {
+        return { success: false, cancelled: true };
+    }
+
+    const res = await adminFetchHandler({
+        url: "/api/admin/backups/create-data",
+        method: "POST",
+    });
+
+    return {
+        success: Boolean(res.success),
+        msg: res.success ? undefined : res.msg || `Couldn't create archive`,
+    };
+}