feat: add supplier payment and allocation models, API, and frontend components

- Created `SupplierPayment` and `SupplierPaymentGRN` models for managing supplier payments and their allocations.
- Implemented API endpoints for listing and creating supplier payments.
- Developed frontend components for displaying and recording supplier payments, including a dialog for payment creation.
- Integrated GRN allocations into the payment creation process, ensuring total allocations match the payment amount.
- Added pagination and loading states for the payments list.

Distribution/Features/SupplierPayment/ISupplierPaymentRepository.cs

@@ -0,0 +1,17 @@
+using Distribution.Models;
+
+namespace Distribution.Features.SupplierPayment;
+
+public interface ISupplierPaymentRepository
+{
+    Task<Models.SupplierPayment?> GetByIdAsync(Guid id);
+    Task<List<Models.SupplierPayment>> ListBySupplierAsync(Guid supplierId, int page, int pageSize);
+    Task<int> CountBySupplierAsync(Guid supplierId);
+    Task AddAsync(Models.SupplierPayment payment);
+
+    /// <summary>Sum of currently-allocated amounts to a GRN, across all active SupplierPayments.</summary>
+    Task<decimal> GetAllocatedTotalForGrnAsync(Guid goodsReceiptId);
+
+    /// <summary>Load a GRN with its items so the total can be computed.</summary>
+    Task<Models.GoodsReceipt?> GetGrnWithItemsAsync(Guid goodsReceiptId);
+}