Description

Export and Import methods are duplicated per format (XML vs JSON) in both WPF projects:

Servy/Services/ServiceCommands.cs:

• ExportXmlConfig() vs ExportJsonConfig() — ~25 lines each, differ only in serializer
• ImportXmlConfig() vs ImportJsonConfig() — ~50 lines each, differ only in deserializer

Servy.Manager/Services/ServiceCommands.cs:

• ExportServiceToXmlAsync() vs ExportServiceToJsonAsync() — ~23 lines each
• ImportXmlConfigAsync() vs ImportJsonConfigAsync() — ~42 lines each

Estimated redundant lines: ~250

Suggested fix

Create generic ExportConfigAsync(format, serializer) and ImportConfigAsync(format, deserializer) methods. Each XML/JSON variant becomes a one-liner.