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/traefik/conf.d/perilous.yml

@@ -20,9 +20,9 @@ http:
     perilous:
       loadBalancer:
         servers:
-          - url: "http://192.168.5.34:3003"
+          - url: "http://perilous-web:3000"
 
     perilous-cs:
       loadBalancer:
         servers:
-          - url: "http://192.168.5.34:8180"
+          - url: "http://perilous-code-server:8443"