Add systemd service and Makefile for Linux installation

Makefile

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+# Makefile for Grokway Server
+
+BINARY_NAME=grokway
+INSTALL_DIR=/opt/grokway
+SERVICE_NAME=grokway.service
+SYSTEMD_DIR=/etc/systemd/system
+
+.PHONY: build clean install uninstall help
+
+help:
+	@echo "Available commands:"
+	@echo "  make build      - Build the server binary"
+	@echo "  make install    - Install the server as a systemd service (requires root)"
+	@echo "  make uninstall  - Remove the server and service (requires root)"
+	@echo "  make clean      - Clean build artifacts"
+
+build:
+	@echo "Building $(BINARY_NAME)..."
+	go build -o $(BINARY_NAME) ./cmd/server
+
+clean:
+	@echo "Cleaning..."
+	rm -f $(BINARY_NAME)
+
+install: build
+	@echo "Installing $(BINARY_NAME) to $(INSTALL_DIR)..."
+	# Create user if not exists
+	id -u grokway &>/dev/null || useradd -r -s /bin/false grokway
+	# Create directory
+	mkdir -p $(INSTALL_DIR)
+	# Copy binary
+	cp $(BINARY_NAME) $(INSTALL_DIR)/
+	# Copy static assets (maintaining structure needed by code)
+	# The code expects ./cmd/server/static relative to CWD
+	mkdir -p $(INSTALL_DIR)/cmd/server
+	cp -r cmd/server/static $(INSTALL_DIR)/cmd/server/
+	# Set permissions
+	chown -R grokway:grokway $(INSTALL_DIR)
+	chmod +x $(INSTALL_DIR)/$(BINARY_NAME)
+	# Install Service
+	cp $(SERVICE_NAME) $(SYSTEMD_DIR)/
+	# Update paths in service file just in case they were modified
+	sed -i 's|WorkingDirectory=.*|WorkingDirectory=$(INSTALL_DIR)|g' $(SYSTEMD_DIR)/$(SERVICE_NAME)
+	sed -i 's|ExecStart=.*|ExecStart=$(INSTALL_DIR)/$(BINARY_NAME)|g' $(SYSTEMD_DIR)/$(SERVICE_NAME)
+	
+	systemctl daemon-reload
+	systemctl enable $(SERVICE_NAME)
+	systemctl start $(SERVICE_NAME)
+	@echo "Installation complete. Service started."
+	@echo "Important: Edit $(SYSTEMD_DIR)/$(SERVICE_NAME) to set GROKWAY_TOKEN environment variable if needed."
+	@echo "Then run: systemctl daemon-reload && systemctl restart $(SERVICE_NAME)"
+	@echo "Check status directly with: systemctl status $(SERVICE_NAME)"
+
+uninstall:
+	@echo "Uninstalling $(BINARY_NAME)..."
+	systemctl stop $(SERVICE_NAME) || true
+	systemctl disable $(SERVICE_NAME) || true
+	rm -f $(SYSTEMD_DIR)/$(SERVICE_NAME)
+	rm -rf $(INSTALL_DIR)
+	# Optional: remove user
+	# userdel grokway || true
+	systemctl daemon-reload
+	@echo "Uninstallation complete."

grokway.service

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+[Unit]
+Description=Grokway Server Service
+After=network.target
+
+[Service]
+# User/Group to run as.
+User=grokway
+Group=grokway
+
+# Working Directory. This is important because the code relies on relative paths
+# like ./cmd/server/static.  If we install everything to /opt/grokway, this works.
+WorkingDirectory=/opt/grokway
+
+# Path to the executable.
+ExecStart=/opt/grokway/grokway
+
+# Environment variables.
+# You MUST set this to a secure token, otherwise a random one is generated on each start.
+#Environment=GROKWAY_TOKEN=your-very-secure-token
+
+# Restart policy.
+Restart=always
+RestartSec=5
+
+# Standard output/error logging.
+StandardOutput=syslog
+StandardError=syslog
+SyslogIdentifier=grokway
+
+[Install]
+WantedBy=multi-user.target