fix: move interactive prompt before unbuffer exec so read works

update-Nitrov3.sh

@@ -11,6 +11,17 @@ if [ -f "$SCRIPT_DIR/.env" ]; then
     set +a
 fi
 
+# Prompt for site URL before unbuffer exec, so interactive input works
+if [ -z "${NITRO_SITE_URL:-}" ]; then
+    read -r -p "Enter your site URL (e.g. https://example.com): " NITRO_SITE_URL
+    NITRO_SITE_URL="${NITRO_SITE_URL%/}"
+    if [ -z "$NITRO_SITE_URL" ]; then
+        echo "=== ❌ NITRO_SITE_URL is required. Set it in .env or enter it now. ==="
+        exit 1
+    fi
+    export NITRO_SITE_URL
+fi
+
 # Real-time output via pseudo-terminal (unbuffer from expect)
 if [ -z "${_UNBUFFERED:-}" ] && command -v unbuffer &> /dev/null; then
     export _UNBUFFERED=1
@@ -42,12 +53,6 @@ NITRO_CLIENT="${NITRO_CLIENT_SRC:-/var/www/Nitro-V3}"
 NITRO_RENDERER="${NITRO_RENDERER_SRC:-/var/www/Nitro_Render_V3}"
 NITRO_BRANCH="${NITRO_BRANCH:-main}"
 
-# Prompt for site URL if not set, so it works on any VPS
-while [ -z "${NITRO_SITE_URL:-}" ]; do
-    read -r -p "Enter your site URL (e.g. https://example.com): " NITRO_SITE_URL
-    NITRO_SITE_URL="${NITRO_SITE_URL%/}"
-done
-
 # Derive ws/wss protocol from the site scheme
 case "$NITRO_SITE_URL" in
     https://*)  NITRO_WS_PROTO="wss://" ; NITRO_DOMAIN="${NITRO_SITE_URL#https://}" ;;