Dispute模块：修复wallet.Entry调用

修复内容：
- 将仲裁释放冻结金额的wallet.Entry从Amount改为AmountCent
- 将号主收入的wallet.Entry从Amount改为AmountCent
- 使用int64(math.Round(amount * 100))将元转为分

编译验证通过 ✅

backend/internal/modules/dispute/repository.go

@@ -358,7 +358,7 @@ func buildArbitrationSettlement(order model.RentalOrder, req ArbitrateRequest, r
 			UserID:      order.RenterID,
 			OrderID:     &orderID,
 			Direction:   "out",
-			Amount:      releaseFrozenAmount,
+			AmountCent:  int64(math.Round(releaseFrozenAmount * 100)),
 			BalanceType: "frozen",
 			BizType:     "arbitration_release_frozen",
 			BizNo:       order.OrderNo,
@@ -381,7 +381,7 @@ func buildArbitrationSettlement(order model.RentalOrder, req ArbitrateRequest, r
 			UserID:      order.OwnerID,
 			OrderID:     &orderID,
 			Direction:   "in",
-			Amount:      amount,
+			AmountCent:  int64(math.Round(amount * 100)),
 			BalanceType: "available",
 			BizType:     "arbitration_owner_income",
 			BizNo:       order.OrderNo,