This PR implements a Contributor License Agreement (CLA) system to ensure all contributors explicitly agree that their contributions are licensed under the project's MIT license.

Changes Made

1. Created CLA.md Documentation

• Bilingual support: Comprehensive CLA document in both Chinese and English
• Clear explanation: Details what a CLA is and why it's needed
• MIT License alignment: Explicitly states contributions will be licensed under MIT
• User-friendly: Provides clear instructions on how to agree to the terms

2. Updated PR Template

• Mandatory CLA checkbox: Added required checkbox for CLA agreement in .github/pull_request_template.md
• Integrated workflow: CLA agreement is now part of the standard PR checklist alongside the existing Code of Conduct requirement
• Clear messaging: Checkbox text explicitly mentions MIT license to avoid confusion

Benefits

• Legal clarity: Provides clear legal framework for contributions
• Community protection: Protects both contributors and the linux.do community
• Compliance: Ensures all future contributions have explicit license agreement
• Transparency: Makes licensing terms clear and accessible to all contributors

Verification

• ✅ All existing license checks still pass
• ✅ Go code compilation successful
• ✅ No breaking changes to existing workflows
• ✅ CLA.md properly links to existing LICENSE file

The implementation follows the project's existing patterns and maintains compatibility with all current workflows while adding the requested CLA functionality.

Fixes #26.

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