feat: add client management controller and footer layout

- Create AddClientController for future client management functionality
- Add footer layout component for consistent page structure

app/Http/Controllers/AddClientController.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use Illuminate\Http\Request;
+
+class AddClientController extends Controller
+{
+    //
+}