feat: update CSV import to support multi-language translations

- Add language parameter to import endpoints and background tasks
- Extract translation fields (title, description, short_description)
- Create/update MarketplaceProductTranslation records during import
- Add MarketplaceProductTranslationSchema for API responses
- Map product_type column to product_type_raw to avoid enum conflict
- Parse prices to numeric format (price_numeric, sale_price_numeric)
- Update marketplace product service for translation-based lookups
- Update CSV export to retrieve titles from translations

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/api/v1/vendor/marketplace.py

@@ -35,12 +35,19 @@ async def import_products_from_marketplace(
     current_user: User = Depends(get_current_vendor_api),
     db: Session = Depends(get_db),
 ):
-    """Import products from marketplace CSV with background processing (Protected)."""
+    """Import products from marketplace CSV with background processing (Protected).
+
+    The `language` parameter specifies the language code for product
+    translations (e.g., 'en', 'fr', 'de'). Default is 'en'.
+
+    For multi-language imports, call this endpoint multiple times with
+    different language codes and CSV files containing translations.
+    """
     vendor = vendor_service.get_vendor_by_id(db, current_user.token_vendor_id)
 
     logger.info(
         f"Starting marketplace import: {request.marketplace} for vendor {vendor.vendor_code} "
-        f"by user {current_user.username}"
+        f"by user {current_user.username} (language={request.language})"
     )
 
     # Create import job (vendor comes from token)
@@ -49,7 +56,7 @@ async def import_products_from_marketplace(
     )
     db.commit()
 
-    # Process in background
+    # Process in background with language parameter
     background_tasks.add_task(
         process_marketplace_import,
         import_job.id,
@@ -57,6 +64,7 @@ async def import_products_from_marketplace(
         request.marketplace,
         vendor.id,
         request.batch_size or 1000,
+        request.language,  # Pass language to background task
     )
 
     return MarketplaceImportJobResponse(
@@ -67,6 +75,7 @@ async def import_products_from_marketplace(
         vendor_code=vendor.vendor_code,
         vendor_name=vendor.name,
         source_url=request.source_url,
+        language=request.language,
         message=f"Marketplace import started from {request.marketplace}. "
         f"Check status with /import-status/{import_job.id}",
         imported=0,