docs: add developer onboarding guide and API endpoint reference

[wheval]

📌 Summary

This PR adds comprehensive developer documentation for the Access Layer server, covering local setup and API endpoint reference.

🎯 Purpose / Motivation

New contributors face two friction points: no documented path to get the server running locally, and no reference for what endpoints exist and what they return. This PR addresses both issues.

🛠️ Changes Made

• Add developer onboarding docs covering local setup and API endpoint reference #598: Add developer onboarding docs covering local setup and API endpoint reference
• Created docs/local-setup.md with prerequisites, step-by-step instructions, and troubleshooting
• Created docs/api-endpoints.md with all public endpoints, auth requirements, and sample responses
• Cross-linked both documents for easy navigation

🧪 How to Test

1. Clone the repo and follow the local setup guide
2. Verify health check works: curl http://localhost:3000/api/v1/health
3. Check API docs at http://localhost:3000/api-docs
4. Test creator list endpoint: curl http://localhost:3000/api/v1/creators

⚠️ Breaking Changes

• None.

🔗 Related Issues

Closes #598

✅ Checklist

• Code builds successfully
• Tests added/updated
• No console errors
• Documentation updated (if needed)

[Chucks1093]

This is really helpful for new contributors. Having both a setup guide and an endpoint reference in one PR means people can go from zero to running the server without digging through the code. Linking the two documents together makes it easy to navigate as well.

[Chucks1093]

I see what you have done here, the setup docs and API reference give new contributors a clear path to get running without guessing at the config. Good job.