feat: UDP messaging client #37

[dkstlzk]

📝 What does this Pull Request do?

Adds a basic UDP messaging client in Go with a CLI.
This client allows sending and receiving text messages over a local network using static UDP ports. The user can specify the local and target ports via CLI flags.

🔧 Type of Change

• 🐛 Bug fix (fixes something that wasn't working)
• ✨ New feature (adds new functionality)
• 💅 Style change (colors, fonts, layout - no functionality change)
• 📚 Documentation update (README, guides, comments)
• 🧪 Tests (adding or fixing tests)
• 🔧 Refactoring (improving code without changing functionality)

🎯 Which part of the project does this affect?

• 🧠 AI/ML Models (AI components in ai/)
• 🔧 Backend (Server logic in backend/)
• 🌐 Frontend (CLI & React.js in frontend/)
• 🌐 Network Layer (P2P networking in network/)
• � Shared Utilities (Common code in shared/)
• 📚 Documentation
• 🚀 CI/CD (GitHub workflows)

🧪 How did you test this?

Tested by running two instances locally in separate terminals, exchanging messages between them.
Verified:

• Messages are received correctly.
• exit command cleanly terminates both instances.
• No errors or nil address logs on exit.
• Default port values work as expected when no flags are passed.

📸 Screenshots (if you changed the UI)

✅ Checklist

• 🔍 I tested my changes and they work
• 💬 My commit messages follow the format (like feat: add login button)
• 🌿 My branch has a descriptive name (like add-login-button or fix-spelling)
• 📝 I have correctly updated the workflows for any new tech stack that I used
• 📖 I read the Contributing Guide if this is my first PR
• 🤔 I would be comfortable explaining my changes to someone else

🤝 Additional Notes