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

app/Domains/Staff/Requests/UpdateStaffRequest.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Domains\Staff\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+use Illuminate\Validation\Rule;
+
+class UpdateStaffRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /** @return array<string, mixed> */
+    public function rules(): array
+    {
+        $staffId = (int) $this->route('staff');
+
+        return [
+            'nombre_apellido' => ['required', 'string', 'max:255'],
+            'dni' => ['required', 'string', 'max:50'],
+            'email' => [
+                'required',
+                'email',
+                'max:255',
+                Rule::unique('users', 'email')->ignore($staffId),
+            ],
+            'category_ids' => ['required', 'array', 'min:1'],
+            'category_ids.*' => ['required', 'integer', 'distinct', Rule::exists('categorias', 'id')],
+        ];
+    }
+}