GKE deployment prototype

[luarss]

Fixes #116

https://cloud.google.com/kubernetes-engine/docs/tutorials/hello-app
https://chatgpt.com/share/683c7f63-4dd0-8000-8a55-fe93c5a7b7b9

graph TD
  subgraph "User Environment"
    User["User Browser"]
    DNS["DNS Record (e.g. frontend.example.com)"]
  end

  subgraph "Web Hosting Layer"
    Ingress["Ingress Controller (NGINX / GKE Ingress)"]
    TLS["Cert renewal via cert-manager or Google Managed Certs"]
  end

  subgraph "GKE Cluster"
    Frontend["Frontend Pod: Next.js"]
    Backend["Backend Pod: FastAPI + SQLite"]
    Mongo["MongoDB Pod"]
    SQLitePVC["Persistent Volume Claim: SQLite"]

    FrontendService["Frontend Service (LoadBalancer or ClusterIP)"]
    BackendService["Backend Service (ClusterIP)"]
    
    Ingress --> FrontendService
    Frontend -->|Sends query| BackendService
    Backend -->|Responds with answer| Frontend
    Backend --> SQLitePVC
    Frontend -->|Sends feedback| Mongo
  end

  User --> DNS --> Ingress
  Ingress --> TLS

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Pending #119 merge. This PR should have a full working deployment.