Add InvoiceService and initial invoice dashboard widget

routes/web.php

@@ -19,7 +19,8 @@
     Route::redirect('/', '/dashboard');
 
     Route::get('dashboard', function () {
-        return Inertia::render('Dashboard');
+        return Inertia::render('Dashboard', 
+        ['dueInvoices' => InvoiceController::getDueInvoices()]);
     })->name('dashboard');
 
     // CRM