Initial commit: Claude Dev Container with Java multi-version, Docker CLI, and web terminal

Makefile

@@ -0,0 +1,40 @@
+.PHONY: help build up down restart logs shell clean
+
+help:
+	@echo "Claude Dev Container - Commands"
+	@echo ""
+	@echo "  make build    - Build the Docker image"
+	@echo "  make up       - Start the container"
+	@echo "  make down     - Stop the container"
+	@echo "  make restart  - Restart the container"
+	@echo "  make logs     - Show container logs"
+	@echo "  make shell    - Open bash shell in container"
+	@echo "  make clean    - Remove container and image"
+	@echo ""
+
+build:
+	docker compose build
+
+up:
+	docker compose up -d
+	@echo ""
+	@echo "Container started!"
+	@echo "  VS Code:      http://localhost:8080"
+	@echo "  Web Terminal: http://localhost:7681"
+	@echo ""
+
+down:
+	docker compose down
+
+restart:
+	docker compose restart
+
+logs:
+	docker compose logs -f
+
+shell:
+	docker exec -it claude-dev-container bash
+
+clean:
+	docker compose down
+	docker rmi claude-dev-container-claude-dev || true