fix: update traefik-dynamic.yml cert paths to /certs/

The entrypoint writes certs to /certs/ but the dynamic config
referenced /etc/traefik/certs/. Since both are baked into the image,
align the paths so only one volume mount is needed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/cameleer-traefik/traefik-dynamic.yml

@@ -20,5 +20,5 @@ tls:
   stores:
     default:
       defaultCertificate:
-        certFile: /etc/traefik/certs/cert.pem
-        keyFile: /etc/traefik/certs/key.pem
+        certFile: /certs/cert.pem
+        keyFile: /certs/key.pem