Initial commit: Paperwall, a standalone e-ink dashboard

Navidrome now-playing, clock, and weather for a Waveshare epd4in0e panel,
with a local web UI and install/uninstall scripts for the Pi.

uninstall.sh

@@ -0,0 +1,43 @@
+#!/bin/bash
+# Removes what install.sh set up: the systemd service and the venv it
+# created. The project folder itself (whatever you SFTP'd over) and any
+# config.json with your settings are left alone -- delete manually if you
+# want those gone too.
+#
+# Does NOT touch SPI/I2C config.txt settings or re-install/re-enable
+# anything else -- Paperwall doesn't depend on or manage other software.
+#
+# Usage: sudo bash uninstall.sh
+
+set -euo pipefail
+
+if [ "$EUID" -ne 0 ]; then
+  echo "Run as root (sudo bash uninstall.sh)" >&2
+  exit 1
+fi
+
+SOURCE="${BASH_SOURCE[0]}"
+while [ -h "$SOURCE" ]; do
+  DIR=$(cd -P "$(dirname "$SOURCE")" >/dev/null 2>&1 && pwd)
+  SOURCE=$(readlink "$SOURCE")
+  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE"
+done
+APP_DIR=$(cd -P "$(dirname "$SOURCE")" >/dev/null 2>&1 && pwd)
+
+SERVICE_NAME="paperwall.service"
+
+echo "==> Stopping and disabling $SERVICE_NAME"
+systemctl disable --now "$SERVICE_NAME" 2>/dev/null || echo "  (not running/installed, skipping)"
+
+echo "==> Removing systemd unit"
+rm -f "/etc/systemd/system/$SERVICE_NAME"
+systemctl daemon-reload
+
+echo "==> Removing virtual environment ($APP_DIR/venv)"
+rm -rf "$APP_DIR/venv"
+
+echo
+echo "==> Paperwall service and venv removed."
+echo "    Project files at $APP_DIR are untouched -- delete the folder yourself if you want it fully gone."
+echo "    If InkyPi was stopped by install.sh and you want it back:"
+echo "        sudo systemctl enable --now inkypi.service"