refactor: reorganize submodule structure and enhance CMake configuration

- Moved all third-party libraries (SDL, ImGui, Asar, etc.) from `src/lib/` and `third_party/` to a new `ext/` directory for better organization and clarity in dependency management.
- Updated CMake configuration to reflect the new paths, ensuring all targets and includes point to the `ext/` directory.
- Enhanced CMake presets to support new build options for AI and gRPC features, improving modularity and build flexibility.
- Added new feature flags for agent UI and remote automation, allowing for more granular control over build configurations.
- Updated documentation to reflect changes in the project structure and build options, ensuring clarity for contributors and users.

src/util/util.cmake

@@ -31,6 +31,7 @@ target_include_directories(yaze_util PUBLIC
   ${CMAKE_SOURCE_DIR}/src
   ${CMAKE_SOURCE_DIR}/incl
   ${CMAKE_SOURCE_DIR}/src/lib
+  ${CMAKE_SOURCE_DIR}/ext
   ${PROJECT_BINARY_DIR}
 )