Add @fileoverview docstring to minify.js

[Lang-Qiu]

Problem Background

The minify.js script in js/js-export/ lacked documentation comments, which reduced code readability and made it harder for contributors to understand its purpose and usage.

Changes

Added a @fileoverview docstring at the beginning of the file to clearly describe the script's functionality: reading ast2blocks.json, parsing its content, and minifying it to ast2blocks.min.json for deployment. This aligns with JSDoc standards and improves maintainability.

Verification

• Review the modified file to confirm the comment is correctly placed and accurately describes the script.
• Ensure no functional changes by running the script (if applicable) to verify that it still produces the expected output without errors.

[github-actions]

🧪 Jest Test Results

✅ All Jest tests passed! This PR is ready to merge.

Coverage: Statements: 48.3% | Branches: 39.91% | Functions: 53.01% | Lines: 48.7%
Master Coverage: Statements: 48.3% | Branches: 39.91% | Functions: 53.01% | Lines: 48.7%