Add completion time and commit hash display to dev ps and mergeto commands

[Copilot]

This PR enhances the dev ps (push) and dev mergeto commands to display completion time and commit hash ID after successful operations, as requested in the issue.

Changes Made

Enhanced dev ps command

After a successful push operation, the command now displays:

Push success
Completion time: 2024/08/12 09:54:10
Commit hash: 9114b43f8a2d1c5e7b9a3d2f1e8c6b4a9d3f2e1c

Enhanced dev mergeto command

After a successful merge operation, the command now displays:

1. Auto switch to target branch: master
2. Successfully pulled master
3. Successfully merged feature-branch into master
Push success
Completion time: 2024/08/12 09:54:10
Commit hash: 9114b43f8a2d1c5e7b9a3d2f1e8c6b4a9d3f2e1c
4. Switch back to the original branch: feature-branch
Merge operation completed
Completion time: 2024/08/12 09:54:10
Commit hash: 9114b43f8a2d1c5e7b9a3d2f1e8c6b4a9d3f2e1c

Implementation Details

• Uses existing time() utility function for consistent date/time formatting in YYYY/MM/DD HH:MM:SS format
• Uses existing getCurrentGitInfo() method to retrieve the latest commit hash after operations
• All changes are non-breaking additions that preserve existing functionality
• Added minimal code (13 lines total) without removing any existing features

The implementation provides users with better visibility into when operations completed and which commit was involved, improving the development workflow and debugging capabilities.

Fixes #53.

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