feat: add systemd service unit and install script

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VsJfJngYUpB4dr77GvcEb8

deploy/brewpi.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=BrewPi temperature controller server
+After=network.target
+
+[Service]
+Type=simple
+User=jens
+WorkingDirectory=/home/jens/work/repos/brewpi
+ExecStart=/home/jens/work/repos/brewpi/.venv/bin/python3 /home/jens/work/repos/brewpi/server/brewpi.py
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target

deploy/install.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SERVICE=brewpi
+UNIT_FILE="$(dirname "$(realpath "$0")")/${SERVICE}.service"
+TARGET=/etc/systemd/system/${SERVICE}.service
+
+sudo cp "$UNIT_FILE" "$TARGET"
+sudo systemctl daemon-reload
+sudo systemctl enable "$SERVICE"
+echo "Installed. Start with: sudo systemctl start $SERVICE"
+echo "View logs with:        journalctl -u $SERVICE -f"