Fix .env loading for standalone repo structure

scripts/install-systemd-services.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+# Installs/updates the tssbot-backend systemd --user unit and (re)starts it.
+set -euo pipefail
+
+repo_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+unit_dir="${HOME}/.config/systemd/user"
+mkdir -p "${unit_dir}"
+
+ln -sf "${repo_dir}/systemd/tssbot-backend.service" "${unit_dir}/tssbot-backend.service"
+
+systemctl --user daemon-reload
+systemctl --user enable --now tssbot-backend.service
+
+if [ "$(loginctl show-user "$(whoami)" -p Linger --value 2>/dev/null)" != "yes" ]; then
+  echo "Linger is not enabled for $(whoami) — user services will stop when you log out."
+  echo "Enable it with: sudo loginctl enable-linger $(whoami)"
+fi
+
+systemctl --user status --no-pager tssbot-backend.service