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/melos.yaml

@@ -0,0 +1,22 @@
+name: krow_workspace
+
+packages:
+  - apps/**
+  - packages/**
+
+command:
+  bootstrap:
+    usePubspecOverrides: true
+
+scripts:
+  gen:l10n:
+    exec: dart run slang
+    description: "Generate localization files using Slang across all packages."
+    packageFilters:
+      dependsOn: slang
+
+  gen:build:
+    exec: dart run build_runner build --delete-conflicting-outputs
+    description: "Run build_runner build across all packages."
+    packageFilters:
+      dependsOn: build_runner