Add VISA backend foundation

README.md

@@ -30,9 +30,15 @@ View your app in AI Studio: https://ai.studio/apps/b6ca5081-8525-4b56-8fbc-92c24
    `docker compose up --build -d`
 4. Open `http://localhost:8080`.
 
-The production image copies the local `dist` directory into
+The production compose stack runs two services:
+
+- `app`: nginx serves the host-built `dist` folder on `http://localhost:8080`
+- `api`: the VISA API runs on `http://localhost:4000`
+
+nginx also proxies API calls under `http://localhost:8080/api/...` to the API
+container. The frontend image copies the local `dist` directory into
 `nginx:stable-alpine3.23-slim`; it does not download Node or reinstall npm
-packages inside Docker.
+packages inside the frontend Docker image.
 
 **Development server (optional, downloads a Node image and dependencies):**
 
@@ -40,3 +46,6 @@ packages inside Docker.
 2. Start the development container:
    `docker compose -f docker-compose.dev.yml up --build`
 3. Open `http://localhost:3000`.
+
+The development compose stack runs Vite on `http://localhost:3000` and the VISA
+API on `http://localhost:4000`.