fix(infra) : fix document storage double nesting in prod

Les fichiers documents étaient stockés sous storage/storage/documents/
au lieu de storage/ directement, causant des 404 en prod.
Le deploy script corrige la structure et le Dockerfile crée le
répertoire var/storage/documents dans l'image.

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

infra/prod/Dockerfile

@@ -75,7 +75,7 @@ COPY --from=frontend-build /app/frontend/.output/public /var/www/html/frontend/.
 RUN echo "APP_ENV=prod" > /var/www/html/.env
 
 # Permissions
-RUN mkdir -p /var/www/html/var /var/www/html/var/uploads \
+RUN mkdir -p /var/www/html/var /var/www/html/var/uploads /var/www/html/var/storage/documents \
     && chown -R www-data:www-data /var/www/html/var
 
 WORKDIR /var/www/html

infra/prod/deploy.sh

@@ -8,6 +8,19 @@ export INVENTORY_IMAGE_TAG="$TAG"
 
 echo "==> Deploying inventory:${TAG}..."
 
+# Fix storage directory structure (one-time migration fix)
+# Files were nested under storage/storage/documents/ instead of storage/ directly
+if [ -d "storage/storage/documents" ]; then
+    echo "==> Fixing storage directory structure..."
+    cp -a storage/storage/documents/* storage/ 2>/dev/null || true
+    rm -rf storage/storage
+    echo "==> Storage structure fixed."
+fi
+
+# Ensure storage directory exists with correct ownership
+mkdir -p storage
+sudo chown -R www-data:www-data storage
+
 echo "==> Enabling maintenance mode..."
 touch maintenance.on