feat(ops): add Makefile, Dockerfile, and K8s manifests

Makefile

@@ -0,0 +1,21 @@
+.PHONY: dev dev-backend dev-frontend build test compose-up
+
+dev:
+	@echo "Starting backend and frontend in parallel..."
+	@make -j 2 dev-backend dev-frontend
+
+dev-backend:
+	cd backend && cargo run
+
+dev-frontend:
+	cd frontend && npm run dev
+
+build:
+	cd frontend && npm run build
+	cd backend && cargo build --release
+
+test:
+	cd backend && cargo test
+
+compose-up:
+	docker-compose up --build