Fix checkout flow to redirect to specific order detail page

🔄 Better UX Flow:
- After successful payment: redirect to /orders/{order_id} instead of /access
- This shows the specific order details where users can see their purchase
- Users can then proceed to payment if needed or access their content

📧 Updated Shortcodes:
- {thank_you_page} now uses dynamic URL pattern: /orders/{order_id}
- {order_id} will be replaced with actual order ID by ShortcodeProcessor
- Added {thank_you_page} to order_created and payment_reminder templates

🎯 User Journey:
1. User receives email with payment link
2. After successful payment → redirected to specific order detail page
3. If not logged in → redirects to login, then back to order detail
4. Order detail page shows payment status and access information

Much better user experience than generic dashboard redirect!

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/pages/Checkout.tsx

@@ -67,7 +67,7 @@ export default function Checkout() {
 
     if (order?.payment_status === "paid") {
       toast({ title: "Pembayaran berhasil!", description: "Akses produk sudah aktif" });
-      navigate("/access");
+      navigate(`/orders/${oid}`);
     } else {
       toast({ title: "Pembayaran pending", description: "Menunggu konfirmasi pembayaran" });
     }
@@ -196,7 +196,7 @@ export default function Checkout() {
 
     if (order?.payment_status === "paid") {
       toast({ title: "Pembayaran berhasil!", description: "Akses produk sudah aktif" });
-      navigate("/access");
+      navigate(`/orders/${orderId}`);
     } else {
       toast({ title: "Belum ada pembayaran", description: "Silakan selesaikan pembayaran" });
     }