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/tests/system/.pi-map.md

@@ -4,11 +4,11 @@ dir: apps/api/tests/system
 index: apps/api/tests/system/.pi-map.index.md
 
 ## role
-System-level integration test suite for the API application.
+System-level integration tests for the API application
 ## files
 - __init__.py | Empty file with no functionality
 ## arch
-Minimal test package structure with placeholder initialization, following Python package conventions for future test module organization.
+Standard Python test package structure with empty initializer for module discovery
 ## tags
 init, empty, functionality
 ## symbols