fix: set permission when postinst

[da13da]

I made the following changes:

• The agent is started by nodex via systemd, which prevented other users from accessing the socket. I updated the permissions to allow access.
• Updating binaries in /opt/bin requires sudo privileges, so I moved the binary to the /home/nodex directory for easier future updates.

root@902092186ed4:/nodex# useradd -r -s /bin/false test
root@902092186ed4:/nodex# sudo -u test curl --unix-socket /home/nodex/.nodex/run/nodex.sock http://localhost/internal/version/get
{"version":"3.0.0"}root@902092186ed4:/nodex#