load btc invoice details in checkout session and storefront order queries

Ensure bitcoin invoice metadata is available when rendering checkout sessions and customer order pages.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/modules/storefrontCheckout/services/CheckoutSessionService.ts

@@ -6,7 +6,7 @@ import type { CookieCartSummary } from '../../storefrontCart/types/CookieCartSum
 import { deriveCheckoutSessionState } from '../../../utils/checkout/deriveCheckoutSessionState';
 import { InvoiceReason } from '../../payment/types/InvoiceReason';
 import { InvoiceService } from '../../payment/services/InvoiceService';
-import { PaymentMethod } from '../../payment/types/PaymentMethod';
+import type { PaymentMethod } from '../../payment/types/PaymentMethod';
 import { CheckoutSessionDiscount } from '../entities/CheckoutSessionDiscount';
 import { CheckoutSessionLine } from '../entities/CheckoutSessionLine';
 import { CheckoutSession } from '../entities/CheckoutSession';
@@ -26,7 +26,14 @@ export class CheckoutSessionService {
     async findById(id: string): Promise<CheckoutSession | null> {
         return this.sessionRepo.findOne({
             where: { id },
-            relations: ['lines', 'discounts', 'invoice', 'invoice.moneroDetails', 'invoice.payments']
+            relations: [
+                'lines',
+                'discounts',
+                'invoice',
+                'invoice.moneroDetails',
+                'invoice.btcDetails',
+                'invoice.payments'
+            ]
         });
     }
 
@@ -87,7 +94,7 @@ export class CheckoutSessionService {
     async cancelSession(sessionId: string): Promise<void> {
         const session = await this.sessionRepo.findOne({
             where: { id: sessionId },
-            relations: ['invoice', 'invoice.moneroDetails', 'invoice.payments']
+            relations: ['invoice', 'invoice.moneroDetails', 'invoice.btcDetails', 'invoice.payments']
         });
 
         if (!session) {