feat: generate ARCHITECTURE.md documenting the project structure

[LRuthes907]

📋 Description

Add ARCHITECTURE.md to the node-ts template, documenting the recommended project structure and best practices for Node.js projects.

🔗 Related Issue

Fixes #32

🧪 Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📝 Documentation update
• 🔧 Configuration change
• 🧹 Code cleanup
• ♻️ Refactoring

📝 How Has This Been Tested?

• Manual review of the generated ARCHITECTURE.md
• Lint and format checks pass
• Unit tests pass
• CI/CD pipeline passes

📷 Screenshots (if applicable)

N/A

✅ Checklist

• My code follows the project's coding standards
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

🔄 Dependencies

None

📚 Additional Notes

This PR adds a template-specific architecture documentation for Node.js projects, following best practices and project conventions.

Issue Reference: Closes #32

[LRuthes907]

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