docs: add production and manual start instructions for system services

docs/INDEX.md

@@ -464,6 +464,26 @@ REDIS_PORT=6379
 
 ### Start System
 
+**Production (systemd):**
+```bash
+# Restart services
+sudo systemctl restart motia.service
+sudo systemctl restart iii-console.service
+
+# Check status
+sudo systemctl status motia.service
+sudo systemctl status iii-console.service
+
+# View real-time logs
+journalctl -u motia.service -f
+journalctl -u iii-console.service -f
+
+# Enable auto-start on boot
+sudo systemctl enable motia.service
+sudo systemctl enable iii-console.service
+```
+
+**Manual (Development):**
 ```bash
 # Start iii Engine
 cd /opt/motia-iii/bitbylaw