Reorganize app workspaces and align Admin architecture

docs/core-modules/file-manager/backend.md

@@ -5,7 +5,7 @@ The backend module exposes authenticated file operations under `/file-manager`.
 Source root:
 
 ```txt
-backend/app/base_modules/FileManager/
+apps/backend/app/base_modules/FileManager/
 ```
 
 ## Request Flow
@@ -252,7 +252,7 @@ DRIVE_DISK=s3
 Adonis Drive config lives in:
 
 ```txt
-backend/config/drive.ts
+apps/backend/config/drive.ts
 ```
 
 Configured disks: