fix first time experience

scripts/dev.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+# Launch the Python backend and the Vite frontend dev server together.
+# Press Ctrl-C to stop both.
+
+set -m
+cd "$(dirname "$0")/.."
+
+cleanup() {
+    trap - INT TERM EXIT
+    for pid in $(jobs -p); do
+        kill -TERM "-$pid" 2>/dev/null || true
+    done
+    wait 2>/dev/null
+}
+trap cleanup INT TERM EXIT
+
+python -m backend.main &
+npm run dev &
+
+while (( $(jobs -pr | wc -l) == 2 )); do
+    sleep 0.5
+done