#21: keep devDependencies in the build stage regardless of NODE_ENV

The deployment sets NODE_ENV=production, and npm omits devDependencies
when it is set - so "npm ci" in the build stage installed no typescript
and "npm run build" failed with exit 127, command not found. The first
Coolify deployment died there.

The build stage now asks for them explicitly rather than depending on the
environment it happens to run in. Reproduced by building all three images
with NODE_ENV=production before and after.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

services/auth/Dockerfile

@@ -2,8 +2,10 @@ FROM node:20-alpine AS build
 WORKDIR /app
 COPY package.json package-lock.json* ./
 # npm ci, not npm install: the image must be the lockfile's content, not
-# whatever resolves the day it is built.
-RUN npm ci
+# whatever resolves the day it is built. --include=dev because this stage
+# needs typescript, and npm omits devDependencies when NODE_ENV=production -
+# which the deployment sets.
+RUN npm ci --include=dev
 COPY . .
 RUN npm run build