Mystify Demo, TwoEleven updates & Snake (#21)

* **New Features**
  * Added Mystify screensaver demo with animated polygons and trails
  * Added Snake game with multiple difficulties, high-score persistence, and multi-input (touch/keyboard) support
  * Added CLI tool for building, packaging, and deploying apps (end-to-end build/install/run workflow)
  * Per-grid-size high-score persistence added to 2048 app; expanded keyboard controls (WASD and device-specific mappings)

* **Documentation**
  * Added Snake README with gameplay, controls, and usage instructions

Apps/Snake/CMakeLists.txt

@@ -0,0 +1,16 @@
+cmake_minimum_required(VERSION 3.20)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+
+if (DEFINED ENV{TACTILITY_SDK_PATH})
+    set(TACTILITY_SDK_PATH $ENV{TACTILITY_SDK_PATH})
+else()
+    set(TACTILITY_SDK_PATH "../../release/TactilitySDK")
+    message(WARNING "⚠️ TACTILITY_SDK_PATH environment variable is not set, defaulting to ${TACTILITY_SDK_PATH}")
+endif()
+
+include("${TACTILITY_SDK_PATH}/TactilitySDK.cmake")
+set(EXTRA_COMPONENT_DIRS ${TACTILITY_SDK_PATH})
+
+project(Snake)
+tactility_project(Snake)