Add main application logic and touch handling functionality

- Implemented main application entry point in main.cpp, initializing queues and event groups.
- Created TouchHandler and EInkTouchHandler classes for handling touch events.
- Added a minimal event loop for touch processing in touch.cpp.
- Introduced unit tests for the hello world application in pytest_hello_world.py.
- Added configuration files for CI and Wokwi support.
- Created empty header files for network and UI modules.

main/Kconfig.projbuild

@@ -0,0 +1,9 @@
+menu "ink-board Configuration"
+
+    config PARTIAL_REFRESH_LIMIT
+        int "Partial Refresh Limit"
+        default 20
+        range 5 100
+        help "Number of partial updates before full refresh"
+
+endmenu