Refactor NVS and WiFi handlers for improved memory management and logging

- Updated KVStorageHandler interface to use std::string instead of char* for key-value operations.
- Enhanced NVSStorageHandler to utilize ESP_LOG for error and info messages instead of printf.
- Refactored WifiHandler to manage WiFi credentials using JSON format for better structure and storage.
- Replaced raw pointers with std::unique_ptr in WifiHandler and NetworkHandler for automatic memory management.
- Removed unused TouchHandler and EInkTouchHandler classes to clean up the codebase.
- Adjusted CMakeLists.txt to remove unnecessary include directories.
- Updated lv_conf.h to enable FreeRTOS and gesture recognition features.

main/CMakeLists.txt

@@ -3,4 +3,4 @@ file(GLOB SRCS "main.cpp" "*.cpp" "*.c" "**/*.cpp" "**/*.c")
 
 idf_component_register(SRCS ${SRCS}
                        PRIV_REQUIRES ${requires}
-                       INCLUDE_DIRS "." "display" "touch" "network" "ui" "io" "common")
+                       INCLUDE_DIRS "." "display" "network" "ui" "io" "common")