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J. Nick Koston
9529adb049
Eliminates virtual dispatch from ESPPreferenceBackend and ESPPreferences. Only one implementation of each exists per platform build, so the polymorphic design was unnecessary overhead — same pattern as OTA (#14473) and socket (#14398) devirtualizations. Each platform's backend class is now a standalone final class in its own header (preference_backend.h). The preferences manager class is extracted to the platform's preferences.h with a PreferencesMixin CRTP base for shared template helpers. core/preference_backend.h provides the PreferenceBackend alias, ESPPreferenceObject, and DECLARE_PREFERENCE_ALIASES macro. core/preferences.h is a thin wrapper including the active platform. ESPPreferenceBackend and ESPPreferences become backward-compatible type aliases to the concrete types. Zero caller changes required.
