fix: Use /run instead of /var/run for socket paths

Eliminates systemd warning about legacy /var/run directory.
/var/run is a symlink to /run on modern systems, but systemd
prefers the canonical /run path.

Author: kvinwang

basefiles/dstack-guest-agent.socket

@@ -10,8 +10,8 @@
 Description=dstack guest agent sockets
 
 [Socket]
-ListenStream=/var/run/dstack.sock
-ListenStream=/var/run/tappd.sock
+ListenStream=/run/dstack.sock
+ListenStream=/run/tappd.sock
 SocketMode=0777
 
 [Install]