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>

models/schema/marketplace_import_job.py

@@ -14,32 +14,9 @@ class MarketplaceImportJobRequest(BaseModel):
     batch_size: int | None = Field(
         1000, description="Processing batch size", ge=100, le=10000
     )
-
-    @field_validator("source_url")
-    @classmethod
-    def validate_url(cls, v):
-        # Basic URL security validation
-        if not v.startswith(("http://", "https://")):
-            raise ValueError("URL must start with http:// or https://")
-        return v.strip()
-
-    @field_validator("marketplace")
-    @classmethod
-    def validate_marketplace(cls, v):
-        return v.strip()
-
-
-class AdminMarketplaceImportJobRequest(BaseModel):
-    """Request schema for admin-triggered marketplace import.
-
-    Includes vendor_id since admin can import for any vendor.
-    """
-
-    vendor_id: int = Field(..., description="Vendor ID to import products for")
-    source_url: str = Field(..., description="URL to CSV file from marketplace")
-    marketplace: str = Field(default="Letzshop", description="Marketplace name")
-    batch_size: int | None = Field(
-        1000, description="Processing batch size", ge=100, le=10000
+    language: str = Field(
+        default="en",
+        description="Language code for product translations (e.g., 'en', 'fr', 'de')",
     )
 
     @field_validator("source_url")
@@ -55,6 +32,54 @@ class AdminMarketplaceImportJobRequest(BaseModel):
     def validate_marketplace(cls, v):
         return v.strip()
 
+    @field_validator("language")
+    @classmethod
+    def validate_language(cls, v):
+        # Basic language code validation (2-5 chars)
+        v = v.strip().lower()
+        if not 2 <= len(v) <= 5:
+            raise ValueError("Language code must be 2-5 characters (e.g., 'en', 'fr')")
+        return v
+
+
+class AdminMarketplaceImportJobRequest(BaseModel):
+    """Request schema for admin-triggered marketplace import.
+
+    Includes vendor_id since admin can import for any vendor.
+    """
+
+    vendor_id: int = Field(..., description="Vendor ID to import products for")
+    source_url: str = Field(..., description="URL to CSV file from marketplace")
+    marketplace: str = Field(default="Letzshop", description="Marketplace name")
+    batch_size: int | None = Field(
+        1000, description="Processing batch size", ge=100, le=10000
+    )
+    language: str = Field(
+        default="en",
+        description="Language code for product translations (e.g., 'en', 'fr', 'de')",
+    )
+
+    @field_validator("source_url")
+    @classmethod
+    def validate_url(cls, v):
+        # Basic URL security validation
+        if not v.startswith(("http://", "https://")):
+            raise ValueError("URL must start with http:// or https://")
+        return v.strip()
+
+    @field_validator("marketplace")
+    @classmethod
+    def validate_marketplace(cls, v):
+        return v.strip()
+
+    @field_validator("language")
+    @classmethod
+    def validate_language(cls, v):
+        v = v.strip().lower()
+        if not 2 <= len(v) <= 5:
+            raise ValueError("Language code must be 2-5 characters (e.g., 'en', 'fr')")
+        return v
+
 
 class MarketplaceImportJobResponse(BaseModel):
     """Response schema for marketplace import job."""
@@ -68,6 +93,7 @@ class MarketplaceImportJobResponse(BaseModel):
     marketplace: str
     source_url: str
     status: str
+    language: str | None = None  # Language used for translations
 
     # Counts
     imported: int = 0