added a new --ls command-line flag to display the contents of specific snapshots

[buildplan]

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[Copilot]

Pull Request Overview

This PR adds a new --ls command-line flag to display the contents of specific snapshots in the restic backup script. The feature provides a convenient way to inspect snapshot contents without performing a restore operation.

• Added --ls flag functionality with snapshot ID and optional path filtering
• Updated help documentation and examples to include the new feature
• Minor code cleanup removing extra whitespace and simplifying comments

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
restic-backup.sh	Added run_ls() function, help text updates, case statement handling, and minor code cleanup
restic-backup.sh.sha256	Updated SHA256 hash to reflect script changes

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