Make installer bring up SSH and disable cdrom apt source

autoinstall/user-data

@@ -35,7 +35,7 @@ autoinstall:
 
   # ── Identity ──────────────────────────────────
   identity:
-    hostname: aiserver
+    hostname: cezenai
     username: cezen
     # Password: cezen@123
     password: "$6$I5VA.42G1xTeVhCv$KCLzqIKg/kbNHZyiTEMAY4FZsJMDDwoS90k6Ffb9VEwmcK.wuzlJNe3ceiEfLrzYzXEvqjYsLc7klAbeGPGab."
@@ -52,6 +52,7 @@ autoinstall:
     - wget
     - python3
     - avahi-daemon
+    - openssh-server
 
   # ── Late commands ─────────────────────────────
   late-commands:
@@ -63,6 +64,10 @@ autoinstall:
     - echo "cezen ALL=(ALL) NOPASSWD:ALL" > /target/etc/sudoers.d/cezen
     - chmod 440 /target/etc/sudoers.d/cezen
 
+    # Disable the installer media APT source so post-install apt uses network
+    # mirrors instead of the custom ISO content.
+    - sed -i 's/^deb cdrom:/# deb cdrom:/' /target/etc/apt/sources.list || true
+
     # Install the Cezen AI payload from the ISO first. Fall back to Git only
     # when building from older media that does not contain /cdrom/cezen-aipackage.
     - mkdir -p /target/opt/aipackage
@@ -96,6 +101,7 @@ autoinstall:
       WantedBy=multi-user.target
       EOF
 
+    - curtin in-target -- systemctl enable ssh
     - curtin in-target -- systemctl enable cezen-setup.service
     - curtin in-target -- systemctl enable avahi-daemon.service