feat: Implement staff management features; add controller, service, resource, routes, and tests for staff and category assignments

app/Domains/Forms/Services/StaffFormService.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Domains\Forms\Services;
+
+use App\Domains\Catalog\Models\Category;
+use App\Domains\Tenant\Models\Tenant;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Collection;
+
+class StaffFormService
+{
+    /** @return array{categories: Collection<int, Category>} */
+    public function get(Tenant $tenant): array
+    {
+        return [
+            'categories' => Category::query()
+                ->whereNull('categoria_id')
+                ->where(function (Builder $query) use ($tenant): void {
+                    $query->where('tenant_code', $tenant->codigo)
+                        ->orWhereHas('catalogItems', fn (Builder $items) => $items
+                            ->where('tenant_code', $tenant->codigo));
+                })
+                ->orderBy('nombre')
+                ->get(),
+        ];
+    }
+}