refactor: better systemd service (#161)

* move `pwsp-daemon.service` from `pwsp-gui/assets` to pwsp-daemon/assets + autorestart service + better logging + wait for pipewire until start

* adapt all packages

* improve systemd service calling for .deb package

pwsp-gui/maintainer-scripts/prerm

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -e
+
+if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ]; then
+    if [ -x "/usr/bin/systemctl" ]; then
+        systemctl --global disable pwsp-daemon.service || true
+
+        for uid_dir in /run/user/*; do
+            if [ -d "$uid_dir/systemd" ]; then
+                uid=$(basename "$uid_dir")
+                if [ "$uid" != "0" ]; then
+                    username=$(id -un "$uid" 2>/dev/null) || continue
+                    su -s /bin/sh -c "XDG_RUNTIME_DIR=$uid_dir systemctl --user stop pwsp-daemon.service" "$username" || true
+                fi
+            fi
+        done
+    fi
+fi
+
+exit 0