Feature: Creating Cart Service, Cart Events, Save For Later functionality, Adding Filament Views for viewing abandoned carts

src/Recovery/Events/CheckoutAbandoned.php

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+<?php
+
+namespace Modules\Core\Recovery\Events;
+
+use Lunar\Models\Cart;
+use Lunar\Models\Order;
+
+/**
+ * A cart's checkout has gone stale (no activity for
+ * config('core.cart.abandoned_after')) with a draft Order already created
+ * (Order::isDraft() — placed_at IS NULL) but never placed. Strong
+ * purchase-intent signal — the shopper committed to checking out, something
+ * blocked completion. Distinct from CartAbandoned, which fires for a cart
+ * with no order at all (weak intent, usually unreachable). Checkout
+ * typically captures an email/address even for a guest, so this state is
+ * normally reachable regardless of login status.
+ *
+ * Lives under Recovery, not Checkout/Cart — abandonment detection/tracking
+ * is deliberately kept out of both modules entirely, including its event
+ * definitions. See docs/cart.md and docs/recovery-strategies.md.
+ *
+ * "Abandoned" is a derived state (stale updated_at, no placed_at), not
+ * something that transitions via a normal Eloquent write — detection is
+ * Recovery's own concern (not yet built; design notes in
+ * docs/recovery-strategies.md).
+ */
+class CheckoutAbandoned
+{
+    public function __construct(
+        public readonly Cart $cart,
+        public readonly Order $order,
+    ) {}
+}