Add install.sh: systemd user service setup

Creates ~/.config/we_monitor/credentials.json template (mode 600),
writes ~/.config/systemd/user/we_monitor.service using the project
venv Python, enables linger for boot-time start, and enables the
service. Does not start until credentials are edited.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

install.sh

@@ -0,0 +1,115 @@
+#!/usr/bin/env bash
+# Install we_monitor as a systemd user service.
+#
+# What this script does:
+#   1. Creates ~/.config/we_monitor/ and a credentials template if missing
+#   2. Writes a systemd user service unit
+#   3. Enables the service (does not start it — edit credentials first)
+#
+# Usage:
+#   chmod +x install.sh
+#   ./install.sh
+#   # then edit ~/.config/we_monitor/credentials.json
+#   systemctl --user start we_monitor
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+SERVICE_NAME="we_monitor"
+CREDS_DIR="$HOME/.config/we_monitor"
+CREDS_FILE="$CREDS_DIR/credentials.json"
+SYSTEMD_DIR="$HOME/.config/systemd/user"
+SERVICE_FILE="$SYSTEMD_DIR/$SERVICE_NAME.service"
+LOG_DIR="$SCRIPT_DIR/logs"
+
+# Prefer project venv, fall back to system python3
+if [[ -x "$SCRIPT_DIR/.venv/bin/python" ]]; then
+    PYTHON="$SCRIPT_DIR/.venv/bin/python"
+else
+    PYTHON="$(command -v python3)"
+fi
+
+echo "==> we_monitor installer"
+echo "    Project : $SCRIPT_DIR"
+echo "    Python  : $PYTHON"
+echo "    User    : $USER"
+echo ""
+
+# ── 1. credentials template ───────────────────────────────────────────────────
+mkdir -p "$CREDS_DIR"
+chmod 700 "$CREDS_DIR"
+
+if [[ ! -f "$CREDS_FILE" ]]; then
+    cat > "$CREDS_FILE" <<'EOF'
+{
+  "username": "me@example.com",
+  "password": "secret",
+  "vin":      "",
+  "domains":  ["charging", "measurements", "readiness"]
+}
+EOF
+    chmod 600 "$CREDS_FILE"
+    echo "==> Created credentials template : $CREDS_FILE"
+    echo "    *** Edit this file before starting the service! ***"
+else
+    echo "==> Credentials file exists      : $CREDS_FILE"
+fi
+
+# ── 2. log directory ──────────────────────────────────────────────────────────
+mkdir -p "$LOG_DIR"
+echo "==> Log directory                : $LOG_DIR"
+
+# ── 3. systemd user service ───────────────────────────────────────────────────
+mkdir -p "$SYSTEMD_DIR"
+
+cat > "$SERVICE_FILE" <<EOF
+[Unit]
+Description=WeConnect vehicle data collector
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+WorkingDirectory=$SCRIPT_DIR
+ExecStart=$PYTHON $SCRIPT_DIR/collect.py -c $CREDS_FILE
+Restart=on-failure
+RestartSec=60
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=$SERVICE_NAME
+
+[Install]
+WantedBy=default.target
+EOF
+
+echo "==> Installed service unit       : $SERVICE_FILE"
+
+# ── 4. enable linger (service survives logout / starts at boot) ───────────────
+if loginctl enable-linger "$USER" 2>/dev/null; then
+    echo "==> Linger enabled for $USER (service starts at boot)"
+else
+    echo "    Note: could not enable linger — service runs only while logged in"
+    echo "    Run as root to fix: loginctl enable-linger $USER"
+fi
+
+# ── 5. reload and enable (but do NOT start yet) ───────────────────────────────
+systemctl --user daemon-reload
+systemctl --user enable "$SERVICE_NAME"
+
+echo ""
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
+echo " Installation complete."
+echo ""
+echo " Next steps:"
+echo "   1. Edit credentials:"
+echo "        \$EDITOR $CREDS_FILE"
+echo ""
+echo "   2. Start the service:"
+echo "        systemctl --user start $SERVICE_NAME"
+echo ""
+echo "   3. Check status:"
+echo "        systemctl --user status $SERVICE_NAME"
+echo ""
+echo "   4. Follow logs:"
+echo "        journalctl --user -u $SERVICE_NAME -f"
+echo "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"