fix: bump Dockerfile to Node 25 to match local npm lock file format

npm ci was failing in CI because the lock file was generated with npm 11
(Node 25) but the Docker build used Node 22 (npm 10), which couldn't
parse it. 🔧

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: phernandez

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:22-bullseye AS build
+FROM node:25-bullseye AS build
 WORKDIR /app
 
 ARG CACHE_BUST=unknown
@@ -16,7 +16,7 @@ COPY . .
 RUN npx nuxt prepare && npx nuxt build
 
 # Production image
-FROM node:22-slim AS prod
+FROM node:25-slim AS prod
 
 RUN apt-get update && apt-get install -y \
     curl \