ออกแบบ API
Design REST APIs following existing architecture.
Update API.md after changes.
ออกแบบฐานข้อมูล
Design normalized PostgreSQL schema.
Update ERD.md and Database.md.
เพิ่มฟีเจอร์
Analyze the requested feature.
Explain impact.
Update documentation.
Implement using Clean Architecture.
Refactor
Improve code quality without changing functionality.
Explain what changed.
Update documentation if necessary.