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_lifecycle_ui_adapter.h

@@ -131,16 +131,5 @@ LiteWalletLifecycleUiExecutionResult executeLiteWalletLifecycleUiRequest(
     config::Settings& settings,
     const LiteWalletLifecycleUiExecutionInput& input);
 
-class LiteWalletLifecycleUiExecutionAdapter {
-public:
-    explicit LiteWalletLifecycleUiExecutionAdapter(config::Settings& settings);
-
-    LiteWalletLifecycleUiExecutionResult execute(
-        const LiteWalletLifecycleUiExecutionInput& input) const;
-
-private:
-    config::Settings& settings_;
-};
-
 } // namespace wallet
 } // namespace dragonx