Fix multi-bill display, charge amount parsing, and charge log responses

- chargeoptions is the real field gating 2000/5000/10000 yen display
- chargeid (not chargenum) carries the actual denomination on charge
- getrecentcharge/getlastlog: fixed num mismatch, added missing result
  section, and added placeholder items for empty result sets

MedusaPluginChargeMachine/Models/Request/GetRecentChargeRequest.cs

@@ -5,6 +5,9 @@ namespace MedusaPluginChargeMachine.Models.Request;
 [XmlRoot("eacharge")]
 public class GetRecentChargeRequest
 {
+    [XmlElement("num")]
+    public string? Num { get; set; }
+
     [XmlElement("sessid")]
     public string? SessionId { get; set; }