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/.pi-map.md

@@ -4,10 +4,10 @@ dir: apps
 index: apps/.pi-map.index.md
 
 ## role
-Contains the main application entry points and executable modules for the project.
+Contains the main deployable application entry points and executable components of the project.
 ## files
 ## arch
-Follows a modular application structure with separate directories for each deployable application, typically using framework-specific patterns (e.g., MVC, MVVM, or component-based architecture depending on the stack).
+Typically follows a multi-app monorepo structure where each subdirectory is an independent application sharing common libraries/modules.
 ## tags
 -
 ## symbols