feat(infra) : persist logs in prod via named volume

Add lesstime_logs volume for var/log/ persistence across container
restarts.

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

infra/prod/docker-compose.yml

@@ -8,6 +8,10 @@ services:
     volumes:
       - ./config/jwt:/var/www/html/config/jwt:ro
       - ./uploads:/var/www/html/var/uploads
+      - lesstime_logs:/var/www/html/var/log
     extra_hosts:
       - "host.docker.internal:host-gateway"
     restart: unless-stopped
+
+volumes:
+  lesstime_logs: