feat: enhance payment status handling and summary in MyPaymentsPage

- Added support for 'partial' payment status in MyPaymentsPage and related components.
- Updated API responses to include 'paid_rials' and 'summary' for invoices.
- Introduced InvoicePaymentStatus service to derive payment status based on actual payments.
- Enhanced tests to cover new payment scenarios including partial payments and payment methods.
- Updated documentation to reflect changes in payment status and API responses.

assets/admin/lib/paymentMethods.ts

@@ -0,0 +1,13 @@
+/** برچسب فارسی روش‌های پرداخت — تنها مرجع؛ در اکاردئون مراجعه و صفحه‌ی پرداخت‌ها مشترک است. */
+export const PAYMENT_METHOD_LABELS: Record<string, string> = {
+  cash: 'نقدی',
+  card: 'کارت',
+  pos: 'کارتخوان',
+  wallet: 'کیف پول',
+  insurance: 'بیمه',
+  online: 'آنلاین',
+  pending: 'در انتظار',
+};
+
+export const paymentMethodLabel = (method: string): string =>
+  PAYMENT_METHOD_LABELS[method] ?? method;