Add Makefile dev/test/docker targets and multi-stage Dockerfile

Makefile: dev runs the Go server (:8080) and Vite (:5173) together and
stops both on Ctrl-C; test runs the gofmt check, go vet, go test -race and
npm ci/typecheck/test; build stamps the version via -ldflags into a static
CGO_ENABLED=0 binary; docker builds the root Dockerfile. VERSION defaults
to git describe with a dev fallback.

Dockerfile: digest-pinned Node 22, Go 1.25 and Alpine 3.22 stages; the
runtime runs as uid 10001 with /data as a volume, EXPOSE 8080 and a
HEALTHCHECK on /health. .dockerignore keeps VCS, design, dependencies,
build output, databases and secrets out of the context.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Makefile

@@ -1,11 +1,41 @@
-# Build entry point: build the PWA, embed it, then build the server binary.
+# MealQuest build entry points.
+#
+#   make dev     Go server on :8080 plus Vite dev server on :5173 (proxies
+#                /api, /auth, /media to :8080). Needs the MEALQUEST_* env set.
+#   make test    gofmt check, go vet, go test -race, npm typecheck and test.
+#   make build   Build the PWA, embed it, build the static binary bin/mealquest.
+#   make docker  Build the container image from ./Dockerfile.
 
 FRONTEND_DIST := internal/frontend/dist
+VERSION ?= $(shell git describe --tags --always --dirty 2>/dev/null || echo dev)
+IMAGE ?= mealquest:$(VERSION)
+LDFLAGS := -s -w -X main.version=$(VERSION)
 
-.PHONY: build web embed check-embed-clean
+.PHONY: dev test go-test web-test build web embed check-embed-clean docker
+
+# Run both servers; Ctrl-C (or either exiting) stops both. The binary is built
+# first and run directly because `go run` would orphan its child on kill.
+dev: SHELL := /bin/bash
+dev:
+	go build -ldflags "$(LDFLAGS)" -o bin/mealquest-dev ./cmd/server
+	@trap 'kill $$(jobs -p) 2>/dev/null; wait' EXIT; \
+	bin/mealquest-dev & \
+	(cd web && exec npm run dev) & \
+	wait -n
+
+test: go-test web-test
+
+go-test:
+	@unformatted="$$(gofmt -l .)"; \
+	if [ -n "$$unformatted" ]; then echo "gofmt needed:"; echo "$$unformatted"; exit 1; fi
+	go vet ./...
+	go test -race ./...
+
+web-test:
+	cd web && npm ci && npm run typecheck && npm test
 
 build: embed
-	go build -o bin/mealquest ./cmd/server
+	CGO_ENABLED=0 go build -trimpath -ldflags "$(LDFLAGS)" -o bin/mealquest ./cmd/server
 
 web:
 	cd web && npm ci && npm run build
@@ -22,3 +52,6 @@ check-embed-clean:
 	touch $(FRONTEND_DIST)/.stale-embed-check
 	$(MAKE) embed
 	test ! -e $(FRONTEND_DIST)/.stale-embed-check
+
+docker:
+	docker build --build-arg VERSION=$(VERSION) -t $(IMAGE) .