Fix Telegram notification: show actual paid amount after discount

Was showing service_fee_cents ($69) instead of actual charge ($35.54).
Now subtracts discount_cents and adds surcharge_cents. Also shows
discount line in notification when a promo code was used.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/src/routes/checkout.ts

@@ -1268,20 +1268,26 @@ export async function handlePaymentComplete(
       const serviceName = (order.service_slug as string)
         || (order.service_name as string)
         || order_type;
-      // Calculate total in dollars
+      // Calculate total in dollars (after discount + surcharge)
       const feeCents = Number(order.service_fee_cents || order.total_cents || 0);
+      const discountCents = Number(order.discount_cents || 0);
+      const surchargeCents = Number(order.surcharge_cents || 0);
       const formationCents = Number(order.formation_fee_cents || 0);
       const stateCents = Number(order.state_fee_cents || 0);
       const addonCents = Number(order.addon_fee_cents || 0);
       const pucCents = Number(order.puc_fee_cents || 0);
-      const totalCents = feeCents + formationCents + stateCents + addonCents + pucCents;
+      const totalCents = feeCents - discountCents + surchargeCents + formationCents + stateCents + addonCents + pucCents;
       const totalDollars = (totalCents / 100).toFixed(2);
 
+      const discountLine = discountCents > 0
+        ? `Discount: -$${(discountCents / 100).toFixed(2)} (${order.discount_code || "promo"})\n`
+        : "";
       const msg = `💰 NEW ORDER\n\n`
         + `Customer: ${customerName}\n`
         + `Email: ${customerEmail}\n`
         + `Service: ${serviceName}\n`
         + `Total: $${totalDollars}\n`
+        + discountLine
         + `Payment: ${paymentMethod}\n`
         + `Order: ${order_id}\n`
         + `Type: ${order_type}`;