Thejpal

Fix windows file lock issue by using delete=False with temp file

1

Fixes: 299 Switched from NamedTemporaryFile to delete=False + manual cleanup to avoid Windows locking errors when invoking docker compose.

**Describe the bug** After installing llmstack library, when running `llmstack` on Windows, the CLI fails to start due to a locked temp file used as the `--env-file` for `docker compose`....