Initial import

frontend/minattest-app-host/README.md

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+minattest-app-host (BFF)
+
+Overview
+- .NET 9 minimal app acting as a reverse proxy for both the React frontend and the API during development.
+- Uses YARP to forward:
+  - `/api/*` to the API (`API_URL`, default `https://localhost:7172`).
+  - everything else to the frontend dev server (`FRONTEND_URL`, default `http://localhost:5173`).
+
+Configure
+- Env vars:
+  - `FRONTEND_URL` (default: `http://localhost:5173`)
+  - `API_URL` (default: `https://localhost:7172`)
+- `launchSettings.json` sets both for dev profiles.
+
+Run
+- Start your API (e.g., at `https://localhost:7172`).
+- Start your React dev server (e.g., `npm run dev` on port 5173).
+- From repo root: `dotnet run --project frontend/minattest-app-host`
+- Open the BFF URL shown in the console (e.g., `https://localhost:10001`).
+  - Requests to `/api/...` go to your API.
+  - All other paths (including `/`) go to the React dev server.
+
+Notes
+- WebSockets are enabled to support HMR from Vite/CRA dev servers.
+- If your API uses the ASP.NET Core dev certificate, ensure it's trusted: `dotnet dev-certs https --trust`.
+- Later, add auth and API composition here while keeping the frontend origin hidden from browsers.