- Add EffectiveConfigOptionKindMap (Single/Multi kind + LastWins/Flag/Multi parser
behavior) and drive field builder + ConfigSetCache from it.
- Single AddDescriptor() in list extensions that dispatches via kind map to
AddSingleDescriptor/AddMultiDescriptor.
- ConfigSetCache: ParseOptionValue/ParseOptionWithSource dispatch by option
name; BuildEffectiveConfig and BuildEffectiveConfigSources use them with
casts; special cases (NoHosts, AddnHosts, server/local, DhcpLeaseFilePath)
remain explicit.
- Add IntegerValueDisplay, LogQueriesDisplay, LocalServiceDisplay; register
integers with bounds/units in EffectiveConfigRenderFragmentRegistry.
- Add EffectiveConfigDescriptorFactory, EffectiveIntegerConfigFieldDescriptor,
IEffectiveConfigFieldDescriptor for integer descriptor metadata.
- Move Client/Http, Services, Parsers under Infrastructure/ (Client, Services, Parsers)
- Move config helpers (DnsmasqConfKeys, DnsmasqOptionTooltips, DnsmasqFileEncoding, EffectiveConfigFieldBuilder) to Infrastructure/Helpers/Config; ApiJsonOptions to Helpers/Http
- Move Configuration types (ApplicationOptions, DnsmasqOptions, DnsmasqOptionsValidator) to Models/Config
- Merge Models/Status and Models/EffectiveConfig into Models/Dnsmasq and Models/Dnsmasq/EffectiveConfig
- Move Client/Models and Client/Services to Models/Client and Infrastructure/Services
- Move ConfigSetSnapshot, HostsSnapshot, ProcessRunResult, ManagedConfigContent from Infrastructure/Services/Abstractions to Models/Contracts
- Update all namespaces and usings; tests pass
alex