Initial baseline: LaraBlog core with plugin commerce surface.

Captures the current working tree after theme slots, ArticleAccess, and the payment / paid-content plugins so subsequent work has a reviewable git history.

lang/en/payment.php

@@ -0,0 +1,21 @@
+<?php
+
+return [
+    'checkout' => [
+        'title' => 'Checkout',
+        'subtitle' => 'Order #:id — stub gateway',
+        'stub_badge' => 'Stub payment',
+        'total' => 'Total',
+        'pay_stub' => 'Simulate payment success',
+        'cancel' => 'Cancel',
+        'back' => 'Back',
+        'already_paid' => 'This order is already paid.',
+        'error_title' => 'Checkout unavailable',
+    ],
+    'errors' => [
+        'already_entitled' => 'You already have an active entitlement for :product_type #:product_id.',
+        'order_not_payable' => 'Order cannot be paid in status [:status].',
+        'invalid_checkout' => 'Invalid checkout parameters, or this product is not purchasable.',
+        'checkout_failed' => 'Could not create the order. Please try again.',
+    ],
+];