Add service concept to pinpoint

Summary

Add "service" concept to pinpoint. A service is a logical group of applications, allowing users to create, manage, and operate within
their own service context.

Scope

• Service Registry CRUD API (create, list, get, update, delete)
• Service selection and context persistence across page navigation
• Backend: naver-service-module, naver-web
• Frontend: service management UI, service selector

Phases

• P1: Service CRUD — users can create and manage services
• P2: Service selection — selected service persists across navigation