Add Porsche API provider and stabilize tests

[augard]

Summary

• add Porsche provider/config/auth/endpoint scaffolding and focused tests
• harden shared logger and remote logger state handling for deterministic tests
• isolate local credential and remote logging tests so the suite passes reliably

Testing

• xcodebuild test -parallel-testing-enabled NO -enableCodeCoverage YES -project KiaMaps.xcodeproj -scheme KiaMaps -destination 'platform=iOS Simulator,name=iPhone 17'\n- xcodebuild test -project KiaMaps.xcodeproj -scheme KiaMaps -destination 'platform=iOS Simulator,name=iPhone 17' -only-testing:KiaTests/RemoteLoggerTests/testConfigurationFromUserDefaults -only-testing:KiaTests/RemoteLoggerTests/testEnableDisableRemoteLogging\n- xcodebuild test -project KiaMaps.xcodeproj -scheme KiaMaps -destination 'platform=iOS Simulator,name=iPhone 17' -only-testing:KiaTests/ExtensionIntegrationTests/testSelectedVehicleVINSharing -only-testing:KiaTests/RemoteLoggingIntegrationTests/testSystemIntegrationScenario -only-testing:KiaTests/LocalCredentialServerTests/testServerHandlesMultipleClients -only-testing:KiaTests/LocalCredentialServerTests/testServerRejectsInvalidPassword -only-testing:KiaTests/LocalCredentialServerTests/testServerRespondsToValidRequest -only-testing:KiaTests/KiaTests/testPerformanceExample