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>

app/modules/loyalty/routes/api/admin.py

@@ -17,12 +17,12 @@ from app.api.deps import get_current_admin_api, require_module_access
 from app.core.database import get_db
 from app.modules.enums import FrontendType
 from app.modules.loyalty.schemas import (
+    MerchantSettingsResponse,
+    MerchantSettingsUpdate,
+    MerchantStatsResponse,
     ProgramListResponse,
     ProgramResponse,
     ProgramStatsResponse,
-    MerchantStatsResponse,
-    MerchantSettingsResponse,
-    MerchantSettingsUpdate,
 )
 from app.modules.loyalty.services import program_service
 from app.modules.tenancy.models import User
@@ -182,7 +182,6 @@ def update_merchant_settings(
     db: Session = Depends(get_db),
 ):
     """Update merchant loyalty settings (admin only)."""
-    from app.modules.loyalty.models import MerchantLoyaltySettings
 
     settings = program_service.get_or_create_merchant_settings(db, merchant_id)
 
@@ -211,7 +210,11 @@ def get_platform_stats(
     """Get platform-wide loyalty statistics."""
     from sqlalchemy import func
 
-    from app.modules.loyalty.models import LoyaltyCard, LoyaltyProgram, LoyaltyTransaction
+    from app.modules.loyalty.models import (
+        LoyaltyCard,
+        LoyaltyProgram,
+        LoyaltyTransaction,
+    )
 
     # Program counts
     total_programs = db.query(func.count(LoyaltyProgram.id)).scalar() or 0