fix(lint): auto-fix ruff violations and tune lint rules

- Auto-fixed 4,496 lint issues (import sorting, modern syntax, etc.)
- Added ignore rules for patterns intentional in this codebase:
  E402 (late imports), E712 (SQLAlchemy filters), B904 (raise from),
  SIM108/SIM105/SIM117 (readability preferences)
- Added per-file ignores for tests and scripts
- Excluded broken scripts/rename_terminology.py (has curly quotes)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/unit/utils/test_csv_processor.py

@@ -8,8 +8,8 @@ import pytest
 import requests
 import requests.exceptions
 
-from app.utils.csv_processor import CSVProcessor
 from app.modules.marketplace.models import MarketplaceProduct
+from app.utils.csv_processor import CSVProcessor
 
 
 @pytest.mark.unit

tests/unit/utils/test_i18n.py

@@ -30,8 +30,8 @@ from app.utils.i18n import (
     is_rtl_language,
     load_translations,
     parse_accept_language,
-    resolve_storefront_language,
     resolve_store_dashboard_language,
+    resolve_storefront_language,
     t,
     translate,
 )

tests/unit/utils/test_vat.py

@@ -3,12 +3,9 @@
 
 from decimal import Decimal
 
-import pytest
-
 from app.utils.vat import (
     EU_VAT_RATES,
     VATRegime,
-    VATResult,
     calculate_vat_amount,
     determine_vat_regime,
     get_vat_rate_for_country,