Add combined development server launcher

README.md

@@ -173,8 +173,16 @@ pirats/
 
 ### Frontend Development
 
-Run the backend (`pirats --reload`) and the Vite dev server side by side; Vite proxies `/api` to port 8000:
+Start the backend and Vite dev server together from the repository root. Pressing Ctrl-C stops both:
+
+```bash
+./dev.sh
+```
+
+To run only the frontend, start the backend separately on port 8000, then run:
 
 ```bash
 cd frontend && npm install && npm run dev
 ```
+
+Vite proxies `/api` to the backend on port 8000.