feat: add admin transaction create/update with auto payment status sync

Allow admins to edit transaction amount and status, recalculate payment totals, and mark invoices fully paid when paid transactions cover the payable amount.

components/payments/paymentController.js

@@ -46,3 +46,15 @@ exports.getMyPayments = catchAsync(async (req, res, next) => {
   const { data, meta } = await paymentService.getMyPayments(req.user._id, req.query);
   return listResponse(res, 200, data, meta);
 });
+
+exports.createTransaction = catchAsync(async (req, res, next) => {
+  const actorId = req.user?._id;
+  const payment = await paymentService.addTransaction(req.params.paymentId, req.body, actorId);
+  return successResponse(res, 201, 'Payment transaction recorded', payment);
+});
+
+exports.updateTransaction = catchAsync(async (req, res, next) => {
+  const actorId = req.user?._id;
+  const payment = await paymentService.updateTransaction(req.params.transactionId, req.body, actorId);
+  return successResponse(res, 200, 'Transaction updated successfully', payment);
+});