Fijar imagenes base a node 22.23.4 y python 3.12.15 (parches de seguridad)

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 # ---------- Stage 1: build del frontend (Vite + TS) ----------
-FROM node:22-slim AS frontend
+FROM node:22.23.4-slim AS frontend
 WORKDIR /build
 COPY frontend/package*.json frontend/
 RUN cd frontend && npm ci
@@ -14,7 +14,7 @@ COPY data/ data/
 RUN cd frontend && npm run build   # emite /build/dist
 
 # ---------- Stage 2: runtime backend (FastAPI + uv) ----------
-FROM python:3.12-slim AS runtime
+FROM python:3.12.15-slim AS runtime
 
 # uv desde su imagen oficial (rápido y reproducible).
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/