refactor: migrate to src/ package + add DinD-based E2E runner with debug artifacts

- Replace legacy standalone scripts with a proper src-layout Python package
  (baudolo backup/restore/configure entrypoints via pyproject.toml)
- Remove old scripts/files (backup-docker-to-local.py, recover-docker-from-local.sh,
  databases.csv.tpl, Todo.md)
- Add Dockerfile to build the project image for local/E2E usage
- Update Makefile: build image and run E2E via external runner script
- Add scripts/test-e2e.sh:
  - start DinD + dedicated network
  - recreate DinD data volume (and shared /tmp volume)
  - pre-pull helper images (alpine-rsync, alpine)
  - load local baudolo:local image into DinD
  - run unittest E2E suite inside DinD and abort on first failure
  - on failure: dump host+DinD diagnostics and archive shared /tmp into artifacts/
- Add artifacts/ debug outputs produced by failing E2E runs (logs, events, tmp archive)

https://chatgpt.com/share/694ec23f-0794-800f-9a59-8365bc80f435

src/baudolo/restore/__main__.py

@@ -0,0 +1,103 @@
+from __future__ import annotations
+
+import argparse
+import sys
+
+from .paths import BackupPaths
+from .files import restore_volume_files
+from .db.postgres import restore_postgres_sql
+from .db.mariadb import restore_mariadb_sql
+
+
+def _add_common_backup_args(p: argparse.ArgumentParser) -> None:
+    p.add_argument("volume_name", help="Docker volume name")
+    p.add_argument("backup_hash", help="Hashed machine id")
+    p.add_argument("version", help="Backup version directory name")
+
+    p.add_argument(
+        "--backups-dir",
+        default="/Backups",
+        help="Backup root directory (default: /Backups)",
+    )
+    p.add_argument(
+        "--repo-name",
+        default="backup-docker-to-local",
+        help="Backup repo folder name under <backups-dir>/<hash>/ (default: backup-docker-to-local)",
+    )
+
+
+def main(argv: list[str] | None = None) -> int:
+    parser = argparse.ArgumentParser(
+        prog="baudolo-restore",
+        description="Restore docker volume files and DB dumps.",
+    )
+    sub = parser.add_subparsers(dest="cmd", required=True)
+
+    p_files = sub.add_parser("files", help="Restore files into a docker volume")
+    _add_common_backup_args(p_files)
+    p_files.add_argument("--rsync-image", default="ghcr.io/kevinveenbirkenbach/alpine-rsync")
+
+    p_pg = sub.add_parser("postgres", help="Restore a single PostgreSQL database dump")
+    _add_common_backup_args(p_pg)
+    p_pg.add_argument("--container", required=True)
+    p_pg.add_argument("--db-name", required=True)
+    p_pg.add_argument("--db-user", default=None, help="Defaults to db-name if omitted")
+    p_pg.add_argument("--db-password", required=True)
+    p_pg.add_argument("--empty", action="store_true")
+
+    p_mdb = sub.add_parser("mariadb", help="Restore a single MariaDB/MySQL-compatible dump")
+    _add_common_backup_args(p_mdb)
+    p_mdb.add_argument("--container", required=True)
+    p_mdb.add_argument("--db-name", required=True)
+    p_mdb.add_argument("--db-user", default=None, help="Defaults to db-name if omitted")
+    p_mdb.add_argument("--db-password", required=True)
+    p_mdb.add_argument("--empty", action="store_true")
+
+    args = parser.parse_args(argv)
+
+    bp = BackupPaths(
+        args.volume_name,
+        args.backup_hash,
+        args.version,
+        repo_name=args.repo_name,
+        backups_dir=args.backups_dir,
+    )
+
+    try:
+        if args.cmd == "files":
+            return restore_volume_files(args.volume_name, bp.files_dir(), rsync_image=args.rsync_image)
+
+        if args.cmd == "postgres":
+            user = args.db_user or args.db_name
+            restore_postgres_sql(
+                container=args.container,
+                db_name=args.db_name,
+                user=user,
+                password=args.db_password,
+                sql_path=bp.sql_file(args.db_name),
+                empty=args.empty,
+            )
+            return 0
+
+        if args.cmd == "mariadb":
+            user = args.db_user or args.db_name
+            restore_mariadb_sql(
+                container=args.container,
+                db_name=args.db_name,
+                user=user,
+                password=args.db_password,
+                sql_path=bp.sql_file(args.db_name),
+                empty=args.empty,
+            )
+            return 0
+
+        parser.error("Unhandled command")
+        return 2
+
+    except Exception as e:
+        print(f"ERROR: {e}", file=sys.stderr)
+        return 1
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())