feat: add plasma-face-unlock

res/systemd/plasma-face-unlockd.socket

@@ -0,0 +1,14 @@
+[Unit]
+Description=Face unlock for KDE Plasma (socket)
+Documentation=man:plasma-face-unlock(1)
+
+[Socket]
+# Everybody may connect. Who may ask for what is decided per request, by the
+# daemon, from the credentials the kernel reports for the other end.
+ListenStream=/run/plasma-face-unlock/socket
+SocketMode=0666
+DirectoryMode=0755
+RemoveOnStop=yes
+
+[Install]
+WantedBy=sockets.target