Aliyun content stack

The first production stack should stay simple: Next.js on ECS or a container service, RDS PostgreSQL for structured metadata, and OSS for files.

OSS should store avatars, resumes, project covers, note attachments, and radar screenshots. PostgreSQL should store searchable metadata, status, sorting, and audit logs.

Later additions

Tair can be introduced later for cache, task locks, and frequent source synchronization. It is not required for the first usable version.