fix(traefik): Add env_file to read Cloudflare token

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

smoothschedule/docker-compose.production.yml

@@ -40,11 +40,8 @@ services:
       - django
     volumes:
       - production_traefik:/etc/traefik/acme
-    environment:
-      # Cloudflare API token for DNS challenge (wildcard certs)
-      # Create at: https://dash.cloudflare.com/profile/api-tokens
-      # Permissions needed: Zone:DNS:Edit for smoothschedule.com
-      - CF_DNS_API_TOKEN=${CF_DNS_API_TOKEN}
+    env_file:
+      - ./.envs/.production/.django
     ports:
       - '0.0.0.0:80:80'
       - '0.0.0.0:443:443'