Migrate perilous to ubuntu-prod

- Update traefik route to use Docker container names instead of host IPs
- Update Dockerfile to build full app with sharp, ejs, marked dependencies
- Simplify docker-compose.yml (remove traefik labels, use file provider routing)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

stacks/perilous/Dockerfile

@@ -1,7 +1,7 @@
 FROM node:18-alpine
+RUN apk add --no-cache python3 make g++ vips-dev
 WORKDIR /usr/src/app
-COPY package.json ./
+COPY content/package.json ./
 RUN npm install
-COPY server.js ./
 EXPOSE 3000
-CMD ["node", "server.js"]
+CMD ["node", "content/server.js"]