chore: track all project map and index files

Add generated .pi-map.md and .pi-map.index.md files across the repository
so the project navigation maps are shared and versioned. These artifacts
are maintained by project_map_init/patch/validate and must be kept in
sync with source edits.

Note: .cache/ remains ignored (added in previous commit).

apps/api/src/schemas/user/.pi-map.md

@@ -0,0 +1,27 @@
+# apps/api/src/schemas/user
+dir: apps/api/src/schemas/user
+
+index: apps/api/src/schemas/user/.pi-map.index.md
+
+## role
+Provides centralized Pydantic data validation schemas for user-related API requests and responses.
+## files
+- __init__.py | Re-exports user-related Pydantic schemas from submodules to provide a unified public API for the user schemas package. | dep: src.schemas.user.user, src.schemas.user.user_config
+- user.py | Defines Pydantic response and update schemas for user profile data | exp: class:UserProfileResponse, class:UserProfileUpdate | dep: uuid, pydantic
+- user_config.py | Defines Pydantic models for user configuration data transfer objects (response and update schemas). | exp: class:UserConfigResponse, class:UserConfigUpdate | dep: pydantic
+## arch
+Modular package pattern with submodule separation of concerns (user profile vs. user config) and unified public API via `__init__.py` re-exports.
+## tags
+user, schemas, response, update, config, pydantic, profile, src
+## symbols
+- UserProfileResponse
+- UserProfileUpdate
+- UserConfigResponse
+- UserConfigUpdate
+## workflows
+- change user behavior
+  read: __init__.py, user.py, user_config.py
+- change user config
+  read: user_config.py
+## dirty
+-