feat(build): add scripts for building frontend and backend for Linux and Windows

build-win-x86_64.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+#
+# Builds the Windows (amd64) binary.
+#   ./build-win-x86_64.sh              backend only
+#   ./build-win-x86_64.sh --frontend   also build the Vue frontend
+#
+# The frontend is needed at runtime: web/ serves it from frontend/dist.
+set -euo pipefail
+
+# Build from the repository root, however the script was invoked.
+cd "$(dirname "$0")"
+
+BUILD_FRONTEND=0
+if [ "${1:-}" = "--frontend" ]; then
+    BUILD_FRONTEND=1
+fi
+
+if [ "$BUILD_FRONTEND" = "1" ]; then
+    echo "Building frontend..."
+    (
+        cd frontend
+        npm ci
+        npm run build
+    )
+fi
+
+echo "Building for Windows (amd64)..."
+
+COMMIT=$(git rev-parse --short HEAD)
+BUILD_DATE=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+
+export GOOS=windows
+export GOARCH=amd64
+export CGO_ENABLED=0
+
+OUTPUT=nukumizu-windows-amd64.exe
+
+echo "Commit: $COMMIT"
+echo "BuildDate: $BUILD_DATE"
+echo "Output: $OUTPUT"
+
+go build -ldflags "-X main.BuildTime=$BUILD_DATE -X main.CommitHash=$COMMIT" -o "$OUTPUT" .
+
+echo "Build succeeded: $OUTPUT"