chore: patch project maps after stale backend test cleanup

Regenerate .pi-map*.md artifacts for source changes in:
- apps/api/src/api/tool/tool_types_validation.py
- apps/api/src/schemas/tool/tool_type.py
- apps/api/tests/integration/test_tool_types_api_extended.py
- and all affected test files from backend-frontend refactoring cleanup

apps/api/src/models/.pi-map.index.md

@@ -2,7 +2,7 @@
 dir: apps/api/src/models
 
 ## role
-Provides the core database model layer with a centralized public API, defining SQLAlchemy base classes and reusable mixins for consistent schema patterns across the API application.
+Centralized database model definitions and shared infrastructure for the API's data layer.
 ## parent
 index: apps/api/src/.pi-map.index.md
 map: apps/api/src/.pi-map.md