Move apps to mobile directory structure

Relocated all app directories (client, design_system_viewer, staff) and their contents under the new 'apps/mobile' path. This change improves project organization and prepares for future platform-specific structuring.

apps/mobile/apps/client/pubspec.yaml

@@ -0,0 +1,38 @@
+name: krowwithus_client
+description: "Krow Client Application"
+publish_to: 'none'
+version: 1.0.0+1
+resolution: workspace
+
+environment:
+  sdk: ^3.10.7
+
+dependencies:
+  flutter:
+    sdk: flutter
+  cupertino_icons: ^1.0.8
+  design_system:
+    path: ../../packages/design_system
+  client_authentication:
+    path: ../../packages/features/client/authentication
+  client_home:
+    path: ../../packages/features/client/home
+  client_settings:
+    path: ../../packages/features/client/settings
+  core_localization:
+    path: ../../packages/core_localization
+  client_hubs:
+    path: ../../packages/features/client/hubs
+  flutter_modular: ^6.3.2
+  flutter_bloc: ^8.1.3
+  flutter_localizations:
+    sdk: flutter
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^6.0.0
+  rename: ^3.1.0
+
+flutter:
+  uses-material-design: true