fix(docker) : créer les dossiers maintenance dans l'image prod

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

infra/prod/Dockerfile

@@ -73,7 +73,8 @@ RUN echo "APP_ENV=prod" > /var/www/html/.env
 
 # Permissions
 RUN mkdir -p /var/www/html/var /var/www/html/var/uploads \
-    && chown -R www-data:www-data /var/www/html/var
+    /var/www/maintenance/sirh /var/www/maintenance/lesstime /var/www/maintenance/inventory \
+    && chown -R www-data:www-data /var/www/html/var /var/www/maintenance
 
 WORKDIR /var/www/html
 EXPOSE 80