Add contract management and invoice settings pages

- Created a new Blade view for managing brand contracts with forms for adding and editing contracts, including client and category selection.
- Implemented success message notifications for contract actions.
- Added a new Blade view for invoice settings, allowing customization of invoice number format, header branding, and default values for new invoices.
- Introduced a new PDF view for generating rate cards with customizable styles based on user profile settings.
- Developed a profile management page for rate cards, enabling users to update their identity, appearance, and visibility settings.

app/Http/Controllers/MediaFileController.php

@@ -41,7 +41,7 @@ class MediaFileController extends Controller
         return view('files.index', compact('files', 'folders', 'folder', 'clients'));
     }
 
-    public function store(Request $request): RedirectResponse
+    public function store(Request $request): RedirectResponse|\Illuminate\Http\JsonResponse
     {
         $request->validate([
             'file'      => 'required|file|max:51200', // 50 MB
@@ -55,6 +55,10 @@ class MediaFileController extends Controller
             $request->input('client_id')
         );
 
+        if ($request->expectsJson() || $request->ajax()) {
+            return response()->json(['success' => true, 'message' => 'File uploaded successfully!']);
+        }
+
         return back()->with('success', '📁 File uploaded successfully!');
     }