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/Response/EaChargeConfigResponse.cs

@@ -12,7 +12,10 @@ public class EaChargeConfigResponse
 
     [XmlAttribute("expire")]
     public required int Expire { get; set; }
-    
+
+    [XmlElement("chargeoptions")]
+    public required XrpcString ChargeOptions { get; set; }
+
     [XmlElement("chargearticle")]
     public required EaChargeConfigChargeArticle ChargeArticle { get; set; }