add development and build scripts

scripts/dev-all.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+
+cleanup() {
+  if [[ -n "${BACKEND_PID:-}" ]]; then
+    kill "$BACKEND_PID" 2>/dev/null || true
+  fi
+  if [[ -n "${WEB_PID:-}" ]]; then
+    kill "$WEB_PID" 2>/dev/null || true
+  fi
+}
+
+trap cleanup EXIT INT TERM
+
+echo "Starting backend API..."
+(
+  cd "$ROOT_DIR/backend"
+  go run ./cmd/api
+) &
+BACKEND_PID=$!
+
+echo "Starting Svelte web client..."
+(
+  cd "$ROOT_DIR/apps/web"
+  npm run dev
+) &
+WEB_PID=$!
+
+wait -n "$BACKEND_PID" "$WEB_PID"
+