fix: mark admin/platform queries as SVC-005 exceptions

These queries are intentionally not vendor-scoped:
- inventory_service: get_vendors_with_inventory_admin (admin cross-vendor)
- background_tasks_service: get_running_test_runs (platform-level)
- marketplace_product_service: get_inventory_info (admin/internal)
- feature_service: Feature query (platform-level, not vendor-scoped)

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

app/services/feature_service.py

@@ -444,6 +444,7 @@ class FeatureService:
             raise TierNotFoundError(tier_code)
 
         # Validate feature codes exist
+        # noqa: SVC-005 - Features are platform-level, not vendor-scoped
         valid_codes = {
             f.code for f in db.query(Feature.code).filter(Feature.is_active == True).all()  # noqa: E712
         }