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.index.md

@@ -0,0 +1,20 @@
+# apps/api/uploads (index)
+dir: apps/api/uploads
+
+## role
+Handles file upload processing, storage, and management for the API application.
+## parent
+index: apps/api/.pi-map.index.md
+map: apps/api/.pi-map.md
+## children
+- apps/api/uploads/avatars
+  index: apps/api/uploads/avatars/.pi-map.index.md
+  map: apps/api/uploads/avatars/.pi-map.md
+## files
+## links
+index: apps/api/uploads/.pi-map.index.md
+map: apps/api/uploads/.pi-map.md
+## workflows
+-
+## dirty
+-