[Code scan] Unknown remote scheduler statuses raise AttributeError

Source: Codex global repository scan of deepmodeling/dpti at commit b719828e7eeb571bd26411430197cd74ea78e38c.
Project: https://github.com/orgs/deepmodeling/projects/27

Problem
`JobStatus` defines `unknow`, but the Slurm/PBS status checks return `JobStatus.unknown` for unrecognized scheduler state words. That branch raises `AttributeError` instead of returning a status.

Code references
https://github.com/deepmodeling/dpti/blob/b719828e7eeb571bd26411430197cd74ea78e38c/dpti/lib/RemoteJob.py#L12
https://github.com/deepmodeling/dpti/blob/b719828e7eeb571bd26411430197cd74ea78e38c/dpti/lib/RemoteJob.py#L323
https://github.com/deepmodeling/dpti/blob/b719828e7eeb571bd26411430197cd74ea78e38c/dpti/lib/RemoteJob.py#L455

Reproduction
Mock `squeue` or `qstat` output with an unexpected status word and call `check_status()`.

Expected result
The enum spelling and return branches should agree so unknown scheduler states are represented without crashing.

Start in dpti/lib/RemoteJob.py at the JobStatus definition and the Slurm/PBS status checks around lines 323 and 455. Mock squeue or qstat output containing an unexpected status word, then call check_status(). Done means the unknown-status branches agree with the enum spelling and return a status without raising AttributeError.

Written by the indexing model from the issue text.