feat(sales): fresh sales implementation

app/Domains/Sales/Http/Requests/SendInvoiceRequest.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Domains\Sales\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+/**
+ * The envelope of an invoice mail: the message itself, who it comes from, who
+ * it goes to, and the optional carbon copies.
+ */
+class SendInvoiceRequest extends FormRequest
+{
+    /**
+     * The send ability is checked in the controller.
+     */
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public function rules(): array
+    {
+        return [
+            'body' => 'required',
+            'subject' => 'required',
+            'from' => 'required',
+            'to' => 'required',
+            'cc' => 'nullable',
+            'bcc' => 'nullable',
+        ];
+    }
+}