chore: initial trade-visualizer import

README.md

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+# trade-visualizer
+
+Standalone local frontend (Vite + React) for the `trade` stack.
+
+## Dev (proxy to VPS)
+
+Default target is `https://trade.mpabi.pl`.
+
+```bash
+npm ci
+npm run dev
+```
+
+Optional env:
+
+- `API_PROXY_TARGET` (default: `https://trade.mpabi.pl`)
+- `GRAPHQL_PROXY_TARGET` (default: same as `API_PROXY_TARGET`)
+- `VITE_API_URL` (default: `/api`)
+- `VITE_HASURA_URL` (default: `/graphql`)
+
+The dev server proxies:
+
+- `/api/*` to the upstream API
+- `/graphql` + `/graphql-ws` to upstream Hasura (supports WS subscriptions)
+- `/auth/*`, `/whoami`, `/logout` to upstream UI (session auth + cookie rewrite for localhost)
+
+## 100% local
+
+Point proxy to your local `trade-frontend` container:
+
+```bash
+API_PROXY_TARGET=http://localhost:8081 GRAPHQL_PROXY_TARGET=http://localhost:8081 npm run dev
+```