optimize: strategy agent graceful exit and auto-resume

[vcfgv]

📝 Pull Request Template

1. Related Issue

Closes #422

2. Type of Change (select one)

Bug Fix, New Feature

3. Description

• feat: enhance auto-resume logic by integrating strategy status updates
• feat: refactor strategy agent to run decision loop in background task for proper lifecycle management
• feat: implement strategy auto-resume logic and enhance runtime management

4. Testing

• I have tested this locally.
• I have updated or added relevant tests.

5. Checklist

• I have read the Code of Conduct
• I have followed the Contributing Guidelines
• My changes follow the project's coding style

[hazeone]

LGTM