✨ feat: DNS nastavenie pri inštalácii (default 8.8.8.8 1.1.1.1)

Nový krok v inštalačnom wizarde — DNS servery s predvolenou hodnotou.
Zobrazuje sa aj v súhrne pred potvrdením.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ct/ubuntu.sh

@@ -91,7 +91,16 @@ simple_install() {
     GATE=""
   fi
 
-  # --- KROK 3: Resources ---
+  # --- KROK 3: DNS ---
+  local dns_input
+  dns_input=$(whiptail --backtitle "Ubuntu LXC Setup" \
+    --title "DNS SERVERY" \
+    --inputbox "\nZadaj DNS servery (oddelené medzerou):" 10 58 "8.8.8.8 1.1.1.1" \
+    3>&1 1>&2 2>&3) || exit_script
+  [[ -z "$dns_input" ]] && dns_input="8.8.8.8 1.1.1.1"
+  NS="-nameserver=${dns_input}"
+
+  # --- KROK 4: Resources ---
   DISK_SIZE=$(whiptail --backtitle "Ubuntu LXC Setup" \
     --title "DISK" \
     --inputbox "\nVeľkosť disku v GB:" 10 58 "$var_disk" \
@@ -196,6 +205,7 @@ simple_install() {
   if [[ -n "$GATE" ]]; then
     echo -e "${TAB}${GATEWAY}${YW} Gateway: ${GN}${GATE}${CL}"
   fi
+  echo -e "${TAB}${INFO}${YW} DNS: ${GN}${dns_input}${CL}"
   echo -e "${TAB}${DISKSIZE}${YW} Disk: ${GN}${DISK_SIZE}GB${CL}"
   echo -e "${TAB}${RAMSIZE}${YW} RAM: ${GN}${RAM_SIZE}MB${CL}"
   echo -e "${TAB}${CPUCORE}${YW} CPU: ${GN}${CORE_COUNT} jadier${CL}"