fix: upgrade to Node.js 20 for globalThis.crypto support

crypto.randomUUID() is used throughout services but crypto is not
a global in Node.js 18. Node.js 20 provides globalThis.crypto.

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

Dockerfile.service

@@ -2,7 +2,7 @@
 # Usage: docker build --build-arg SERVICE_NAME=auth-service --build-arg SERVICE_PORT=3001 -f Dockerfile.service .
 
 # ===== Build Stage =====
-FROM node:18-alpine AS builder
+FROM node:20-alpine AS builder
 
 RUN corepack enable
 
@@ -37,7 +37,7 @@ ARG SERVICE_NAME
 RUN pnpm turbo build --filter='./packages/shared/*' --filter=@it0/${SERVICE_NAME}
 
 # ===== Production Stage =====
-FROM node:18-alpine
+FROM node:20-alpine
 
 RUN corepack enable
 

it0-web-admin/Dockerfile

@@ -1,5 +1,5 @@
 # Next.js standalone production Dockerfile
-FROM node:18-alpine AS builder
+FROM node:20-alpine AS builder
 
 WORKDIR /app
 
@@ -11,7 +11,7 @@ COPY . .
 RUN npm run build
 
 # ===== Production =====
-FROM node:18-alpine
+FROM node:20-alpine
 
 WORKDIR /app