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.

src/Billing/Entity/Invoice.php

@@ -93,6 +93,7 @@ class Invoice
     public function getTotalRials(): int    { return $this->totalRials; }
     public function getPatientRials(): int  { return $this->patientRials; }
     public function getIssuedAt(): int      { return $this->issuedAt; }
+    public function getPatientSessionId(): ?int { return $this->patientSessionId; }
     /** @return Collection<int, InvoiceItem> */
     public function getItems(): Collection  { return $this->items; }