fix find_free_port: single ss call, grep for :PORT pattern

install.sh

@@ -18,12 +18,12 @@ step()  { echo -e "\n${CYAN}━━━ $1 ━━━${NC}"; }
 mark_done() { echo "$1" >> "$PROGRESS_FILE"; }
 is_done()   { grep -qx "$1" "$PROGRESS_FILE" 2>/dev/null; }
 
-# ─── Find free port (check + increment until free) ──────────────
+# ─── Find free port (check via ss, single pass) ────────────────
 find_free_port() {
   local port=$1 max=$2
   max="${max:-65535}"
   while [ "$port" -le "$max" ]; do
-    if ! ss -tlnp "sport = :$port" 2>/dev/null | grep -q .; then
+    if ! ss -tlnp 2>/dev/null | grep -q ":$port "; then
       echo "$port"
       return 0
     fi
@@ -213,7 +213,7 @@ for pair in "POSTGRES_PORT:5432" "REDIS_PORT:6379" "RABBITMQ_PORT:5672" "RABBITM
   current=$(grep "^${var}=" "$INSTALL_DIR/.env" 2>/dev/null | cut -d= -f2) || true
   current="${current:-$default}"
 
-  if ss -tlnp "sport = :$current" 2>/dev/null | grep -q .; then
+  if ss -tlnp 2>/dev/null | grep -q ":$current "; then
     warn "Port $current ($var) is busy — finding free port..."
     new_port=$(find_free_port "$((current + 1))" 2>/dev/null) || new_port=$((current + 100))
     set_env "$var" "$new_port"