add Makefile with make install for fedora deploy

builds and installs the systemd service from a fresh checkout; substitutes
real node path / prefix into the unit. README documents it as the quick path.

Makefile

@@ -0,0 +1,79 @@
+# wutzcalc — build and deploy
+#
+# Fresh Fedora box, as root:
+#
+#   make install      # system deps + build + systemd service
+#
+# Then set the admin password in /etc/wutzcalc/wutzcalc.env and:
+#
+#   systemctl enable --now wutzcalc
+#
+# Without root you can still `make build` to compile the client + server.
+
+PREFIX       ?= /opt/wutzcalc
+CONFDIR      ?= /etc/wutzcalc
+SERVICE_USER ?= wutzcalc
+UNIT         := /etc/systemd/system/wutzcalc.service
+
+.PHONY: all build deps install service uninstall clean require-root
+
+all: build
+
+## build: install dependencies and build client + server
+build:
+	pnpm install --frozen-lockfile
+	pnpm build
+
+## deps: install Node.js, pnpm and native-module build tools (Fedora)
+deps: require-root
+	dnf install -y nodejs gcc-c++ make python3
+	corepack enable
+
+## install: full production install on a fresh checkout (Fedora)
+install: require-root deps build service
+	@echo
+	@echo "Installed to $(PREFIX)."
+	@echo "1. Set ADMIN_PASSWORD in $(CONFDIR)/wutzcalc.env"
+	@echo "2. systemctl enable --now wutzcalc"
+
+## service: create the user, copy files, and install the systemd unit
+service: require-root
+	# Dedicated system user (no login, no home).
+	id -u $(SERVICE_USER) >/dev/null 2>&1 || \
+		useradd --system --no-create-home --shell /usr/sbin/nologin $(SERVICE_USER)
+	# Copy the whole tree so pnpm's symlinked node_modules stay intact.
+	mkdir -p $(PREFIX)
+	cp -a . $(PREFIX)/
+	# Config + secrets — never clobber an existing env file.
+	mkdir -p $(CONFDIR)
+	test -f $(CONFDIR)/wutzcalc.env || \
+		install -m 600 deploy/wutzcalc.env.example $(CONFDIR)/wutzcalc.env
+	# Install the unit with the real node path and install prefix substituted in.
+	NODE=$$(command -v node); \
+	sed -e "s|/opt/wutzcalc|$(PREFIX)|g" \
+	    -e "s|/usr/bin/node|$$NODE|g" \
+	    -e "s|^User=wutzcalc|User=$(SERVICE_USER)|" \
+	    -e "s|^Group=wutzcalc|Group=$(SERVICE_USER)|" \
+	    deploy/wutzcalc.service > $(UNIT)
+	systemctl daemon-reload
+
+## uninstall: stop and remove the service (keeps DB and config)
+uninstall: require-root
+	-systemctl disable --now wutzcalc
+	rm -f $(UNIT)
+	systemctl daemon-reload
+	rm -rf $(PREFIX)
+	@echo "Removed $(PREFIX). Left $(CONFDIR) and /var/lib/wutzcalc in place."
+
+## clean: remove build output and installed dependencies
+clean:
+	rm -rf node_modules dist \
+		client/dist client/node_modules \
+		server/dist server/node_modules \
+		shared/dist shared/node_modules
+
+require-root:
+	@if [ "$$(id -u)" -ne 0 ]; then \
+		echo "This target needs root — run: sudo make $(MAKECMDGOALS)"; \
+		exit 1; \
+	fi