refactor(lite): drop 4 unused OOP wrapper classes over free functions

Each of these classes wrapped an existing free function with a one-line
delegating method and was never instantiated anywhere (verified: no references
outside their own translation unit, not even within their own .cpp beyond the
definition) — the redundant "wrapper layer" pattern CLAUDE.md warns against:

- LiteWalletLifecycleUiExecutionAdapter      -> executeLiteWalletLifecycleUiRequest
- LiteWalletServerSelectionUiExecutionAdapter -> executeLiteWalletServerSelectionUi
- LiteWalletServerLifecycleReadinessPlanner   -> evaluateLiteWalletServerLifecycleReadiness
- LiteBackendActivationReadinessAdapter       -> evaluateLiteBackendActivationReadiness

The live free functions (the actual entry points used by the UI/runtime) are
unchanged. Both targets build, test suite passes, source-hygiene clean.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/wallet/lite_wallet_server_selection_adapter.cpp

@@ -447,17 +447,5 @@ LiteWalletServerSelectionUiExecutionResult executeLiteWalletServerSelectionUi(
     return result;
 }
 
-LiteWalletServerSelectionUiExecutionAdapter::LiteWalletServerSelectionUiExecutionAdapter(
-    config::Settings& settings)
-    : settings_(settings)
-{
-}
-
-LiteWalletServerSelectionUiExecutionResult LiteWalletServerSelectionUiExecutionAdapter::execute(
-    const LiteWalletServerSelectionUiExecutionInput& input) const
-{
-    return executeLiteWalletServerSelectionUi(settings_, input);
-}
-
 } // namespace wallet
 } // namespace dragonx