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/admin/marketplace.py

@@ -22,6 +22,7 @@ from models.schema.marketplace_import_job import (
     MarketplaceImportJobRequest,
     MarketplaceImportJobResponse,
 )
+from models.schema.stats import ImportStatsResponse
 
 router = APIRouter(prefix="/marketplace-import-jobs")
 logger = logging.getLogger(__name__)
@@ -68,6 +69,9 @@ async def create_marketplace_import_job(
 
     Admins can trigger imports for any vendor by specifying vendor_id.
     The import is processed asynchronously in the background.
+
+    The `language` parameter specifies the language code for product
+    translations (e.g., 'en', 'fr', 'de'). Default is 'en'.
     """
     vendor = vendor_service.get_vendor_by_id(db, request.vendor_id)
 
@@ -75,6 +79,7 @@ async def create_marketplace_import_job(
         source_url=request.source_url,
         marketplace=request.marketplace,
         batch_size=request.batch_size,
+        language=request.language,
     )
 
     job = marketplace_import_job_service.create_import_job(
@@ -87,7 +92,7 @@ async def create_marketplace_import_job(
 
     logger.info(
         f"Admin {current_admin.username} created import job {job.id} "
-        f"for vendor {vendor.vendor_code}"
+        f"for vendor {vendor.vendor_code} (language={request.language})"
     )
 
     background_tasks.add_task(
@@ -97,19 +102,21 @@ async def create_marketplace_import_job(
         request.marketplace,
         vendor.id,
         request.batch_size or 1000,
+        request.language,  # Pass language to background task
     )
 
     return marketplace_import_job_service.convert_to_response_model(job)
 
 
 # NOTE: /stats must be defined BEFORE /{job_id} to avoid route conflicts
-@router.get("/stats")
+@router.get("/stats", response_model=ImportStatsResponse)
 def get_import_statistics(
     db: Session = Depends(get_db),
     current_admin: User = Depends(get_current_admin_api),
 ):
     """Get marketplace import statistics (Admin only)."""
-    return stats_service.get_import_statistics(db)
+    stats = stats_service.get_import_statistics(db)
+    return ImportStatsResponse(**stats)
 
 
 @router.get("/{job_id}", response_model=AdminMarketplaceImportJobResponse)