Add Docker build and run workflow

Makefile

@@ -0,0 +1,56 @@
+IMAGE_NAME ?= notes-vault-client
+IMAGE_TAG ?= latest
+CONTAINER_NAME ?= notes-vault-client
+HOST_PORT ?= 8081
+NOTES_API_UPSTREAM ?= http://host.docker.internal:8080
+
+IMAGE := $(IMAGE_NAME):$(IMAGE_TAG)
+
+.PHONY: help install build docker-build docker-run docker-stop docker-restart docker-logs docker-clean
+
+help:
+	@echo "Targets:"
+	@echo "  make install          Install Node dependencies"
+	@echo "  make build            Build the Vite app into dist/"
+	@echo "  make docker-build     Build the Docker image"
+	@echo "  make docker-run       Run the Docker container"
+	@echo "  make docker-stop      Stop the running Docker container"
+	@echo "  make docker-restart   Rebuild and restart the Docker container"
+	@echo "  make docker-logs      Follow container logs"
+	@echo "  make docker-clean     Remove the Docker image"
+	@echo ""
+	@echo "Variables:"
+	@echo "  IMAGE_NAME=$(IMAGE_NAME)"
+	@echo "  IMAGE_TAG=$(IMAGE_TAG)"
+	@echo "  CONTAINER_NAME=$(CONTAINER_NAME)"
+	@echo "  HOST_PORT=$(HOST_PORT)"
+	@echo "  NOTES_API_UPSTREAM=$(NOTES_API_UPSTREAM)"
+
+install:
+	npm ci
+
+build:
+	npm run build
+
+docker-build:
+	docker build -t $(IMAGE) .
+
+docker-run:
+	docker rm -f $(CONTAINER_NAME) >/dev/null 2>&1 || true
+	docker run --rm -d \
+		--name $(CONTAINER_NAME) \
+		-p $(HOST_PORT):80 \
+		-e NOTES_API_UPSTREAM=$(NOTES_API_UPSTREAM) \
+		$(IMAGE)
+	@echo "Running $(IMAGE) at http://localhost:$(HOST_PORT)"
+
+docker-stop:
+	docker stop $(CONTAINER_NAME)
+
+docker-restart: docker-build docker-run
+
+docker-logs:
+	docker logs -f $(CONTAINER_NAME)
+
+docker-clean:
+	docker image rm $(IMAGE)