feat: add Makefile and systemd service for linux deployment

env-guard.service

@@ -0,0 +1,26 @@
+[Unit]
+Description=EnvGuard Server
+After=network.target
+
+[Service]
+# User/Group: Run as root by default to ensure permission to write to /var/lib/env-guard
+# You can change this to a specific user if preferred (e.g., User=envguard), 
+# but remember to 'chown -R envguard:envguard /var/lib/env-guard'
+User=root
+Group=root
+
+# Path to the binary
+ExecStart=/usr/local/bin/env-guard-server
+
+# Directory where services.json and history.json will be stored
+WorkingDirectory=/var/lib/env-guard
+
+# Restart policy
+Restart=always
+RestartSec=5
+
+# Environment variables if needed
+# Environment=ENVGUARD_SECRET_TOKEN=your-secret-token
+
+[Install]
+WantedBy=multi-user.target