Component Diagram

flowchart LR
    subgraph Frontend
      UI[Web UI]
    end
    subgraph Backend
      AUTH[Auth Service]
      ORDER[Order Service]
      PAY[Payment Service]
    end
    subgraph Data
      PG[(Postgres)]
      RD[(Redis)]
    end
    UI -->|HTTPS| AUTH
    UI -->|HTTPS| ORDER
    ORDER -->|gRPC| PAY
    AUTH --> PG
    ORDER --> PG
    AUTH --> RD