minor

dashboard/README.md

@@ -0,0 +1,17 @@
+# Dashboard
+
+Flutter frontend for the building materials catalog.
+
+## Run
+
+```bash
+flutter pub get
+flutter run -d chrome --dart-define=API_BASE_URL=http://localhost:8080/api/v1
+```
+
+Dashboard reads `API_BASE_URL` in this order:
+1. `--dart-define=API_BASE_URL=...`
+2. `assets/env` (`API_BASE_URL=...`)
+3. default `http://localhost:8080/api/v1`
+
+Container build writes `API_BASE_URL` into `assets/env` from Docker build arg.