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/uploads/.pi-map.md

@@ -0,0 +1,18 @@
+# apps/api/uploads
+dir: apps/api/uploads
+
+index: apps/api/uploads/.pi-map.index.md
+
+## role
+Handles file upload processing, storage, and management for the API application.
+## files
+## arch
+Modular service-oriented architecture with dedicated modules for different upload types (avatars, documents, images), using NestJS controllers/services with S3/cloud storage integration, file validation, and database persistence for upload metadata.
+## tags
+-
+## symbols
+-
+## workflows
+-
+## dirty
+-