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/run.py

@@ -0,0 +1,81 @@
+from __future__ import annotations
+
+import subprocess
+import sys
+from typing import Optional
+
+
+def run(
+    cmd: list[str],
+    *,
+    stdin=None,
+    capture: bool = False,
+    env: Optional[dict] = None,
+) -> subprocess.CompletedProcess:
+    try:
+        return subprocess.run(
+            cmd,
+            check=True,
+            stdin=stdin,
+            capture_output=capture,
+            env=env,
+        )
+    except subprocess.CalledProcessError as e:
+        msg = f"ERROR: command failed ({e.returncode}): {' '.join(cmd)}"
+        print(msg, file=sys.stderr)
+        if e.stdout:
+            try:
+                print(e.stdout.decode(), file=sys.stderr)
+            except Exception:
+                print(e.stdout, file=sys.stderr)
+        if e.stderr:
+            try:
+                print(e.stderr.decode(), file=sys.stderr)
+            except Exception:
+                print(e.stderr, file=sys.stderr)
+        raise
+
+
+def docker_exec(
+    container: str,
+    argv: list[str],
+    *,
+    stdin=None,
+    capture: bool = False,
+    env: Optional[dict] = None,
+    docker_env: Optional[dict[str, str]] = None,
+) -> subprocess.CompletedProcess:
+    cmd: list[str] = ["docker", "exec", "-i"]
+    if docker_env:
+        for k, v in docker_env.items():
+            cmd.extend(["-e", f"{k}={v}"])
+    cmd.extend([container, *argv])
+    return run(cmd, stdin=stdin, capture=capture, env=env)
+
+
+def docker_exec_sh(
+    container: str,
+    script: str,
+    *,
+    stdin=None,
+    capture: bool = False,
+    env: Optional[dict] = None,
+    docker_env: Optional[dict[str, str]] = None,
+) -> subprocess.CompletedProcess:
+    return docker_exec(
+        container,
+        ["sh", "-lc", script],
+        stdin=stdin,
+        capture=capture,
+        env=env,
+        docker_env=docker_env,
+    )
+
+
+def docker_volume_exists(volume: str) -> bool:
+    p = subprocess.run(
+        ["docker", "volume", "inspect", volume],
+        stdout=subprocess.DEVNULL,
+        stderr=subprocess.DEVNULL,
+    )
+    return p.returncode == 0