Refactor Jenkinsfile and wait-for-jenkins-stack.sh for improved E2E testing

- Removed the wait-for-jenkins-stack.sh script from the Jenkinsfile, integrating its functionality directly into the Jenkins pipeline for better clarity and efficiency.
- Enhanced the wait logic for backend and frontend services, implementing a reusable function in the script to streamline the waiting process and improve error handling.
- Updated comments to clarify the purpose and behavior of the changes, ensuring better understanding of the E2E testing setup.

scripts/wait-for-jenkins-stack.sh

@@ -1,31 +1,34 @@
 #!/usr/bin/env bash
-# Espera API y Vite levantados en el host (tras docker compose), para E2E en CI.
+# Espera a que backend y frontend estén sirviendo tras `docker compose up`.
+#
+# Uso en Jenkins: el wait real corre dentro del contenedor Playwright con
+# --network host (ver Jenkinsfile). Este script es para dev/local cuando los
+# puertos 8000/5173 sí son alcanzables desde el shell que lo invoca.
 set -euo pipefail
-BACKEND_MAX_SEC="${BACKEND_MAX_SEC:-600}"
+
+BACKEND_URL="${BACKEND_URL:-http://localhost:8000/api/health}"
+FRONTEND_URL="${FRONTEND_URL:-http://localhost:5173/}"
+BACKEND_MAX_SEC="${BACKEND_MAX_SEC:-900}"
 FRONTEND_MAX_SEC="${FRONTEND_MAX_SEC:-300}"
-i=0
-while true; do
-  if curl -fsS "http://localhost:8000/api/health" >/dev/null 2>&1; then
-    echo "== stack: backend listo =="
-    break
-  fi
-  i=$((i + 2))
-  if [ "$i" -ge "$BACKEND_MAX_SEC" ]; then
-    echo "ERROR: timeout esperando http://localhost:8000/api/health (${BACKEND_MAX_SEC}s)"
-    exit 1
-  fi
-  sleep 2
-done
-i=0
-while true; do
-  if curl -fsS "http://localhost:5173/" >/dev/null 2>&1; then
-    echo "== stack: frontend listo =="
-    exit 0
-  fi
-  i=$((i + 2))
-  if [ "$i" -ge "$FRONTEND_MAX_SEC" ]; then
-    echo "ERROR: timeout esperando http://localhost:5173/ (${FRONTEND_MAX_SEC}s)"
-    exit 1
-  fi
-  sleep 2
-done
+STEP="${STEP:-5}"
+
+wait_for() {
+  local url="$1" max="$2" label="$3"
+  echo "== wait: ${label} ${url} =="
+  local i=0
+  until curl -fsS --connect-timeout 3 --max-time 5 "$url" >/dev/null 2>&1; do
+    i=$((i + STEP))
+    if [ "$i" -ge "$max" ]; then
+      echo "ERROR: timeout esperando ${label} ${url} (${max}s)"
+      return 1
+    fi
+    if [ $((i % 30)) -eq 0 ]; then
+      echo "   ...esperando ${label} (${i}/${max}s)"
+    fi
+    sleep "$STEP"
+  done
+  echo "== ${label} listo tras ${i}s =="
+}
+
+wait_for "$BACKEND_URL"  "$BACKEND_MAX_SEC"  "backend"
+wait_for "$FRONTEND_URL" "$FRONTEND_MAX_SEC" "frontend"