Fetch and display tested server IP and country (with emoji) in speed tests. Adds CountryExtension for country->emoji mapping and a new IpInfoResult type; ConnectionHandler now retrieves/parses IP API results and GetRealPingTime signature adjusted. Models and entities (ProfileItemModel, ProfileExItem, SpeedTestResult) gain IpInfo fields; ProfileExManager can store test IP info. UI/UX updated: new IpInfo column in ProfilesView (desktop and Avalonia), ResUI resource strings for "IP Info", and EServerColName ordering supports IpInfo. SpeedtestService now captures IP info and forwards it to the view model via the update function.
Move many model classes into new sub-namespaces (ServiceLib.Models.CoreConfigs, ServiceLib.Models.Configs, ServiceLib.Models.Dto, ServiceLib.Models.Entities). Update GlobalUsings in ServiceLib, v2rayN.Desktop, v2rayN and add a tests GlobalUsings file to reference the new namespaces. Adjust static using directives in ClashApiManager and ClashProxiesViewModel to use ServiceLib.Models.Dto. This is a reorganization/rename of files and namespaces with no functional changes.
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