feat: implement AI styling foundation and billing scope rework

app/Http/Requests/Api/GuestAiEditStoreRequest.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Http\Requests\Api;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class GuestAiEditStoreRequest extends FormRequest
+{
+    public function authorize(): bool
+    {
+        return true;
+    }
+
+    public function rules(): array
+    {
+        return [
+            'style_key' => ['nullable', 'string', 'max:120', 'required_without:prompt'],
+            'prompt' => ['nullable', 'string', 'max:2000', 'required_without:style_key'],
+            'negative_prompt' => ['nullable', 'string', 'max:2000'],
+            'provider_model' => ['nullable', 'string', 'max:120'],
+            'idempotency_key' => ['nullable', 'string', 'max:120'],
+            'session_id' => ['nullable', 'string', 'max:191'],
+            'metadata' => ['nullable', 'array'],
+        ];
+    }
+}