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.

cmake/dependencies/imgui.cmake

@@ -1,10 +1,10 @@
 # Dear ImGui dependency management
-# Uses the bundled ImGui in src/lib/imgui
+# Uses the bundled ImGui in ext/imgui
 
 message(STATUS "Setting up Dear ImGui from bundled sources")
 
-# Use the bundled ImGui from src/lib/imgui
-set(IMGUI_DIR ${CMAKE_SOURCE_DIR}/src/lib/imgui)
+# Use the bundled ImGui from ext/imgui
+set(IMGUI_DIR ${CMAKE_SOURCE_DIR}/ext/imgui)
 
 # Create ImGui library with core files from bundled source
 add_library(ImGui STATIC
@@ -35,7 +35,7 @@ message(STATUS "Created ImGui target from bundled source at ${IMGUI_DIR}")
 
 # Create ImGui Test Engine for test automation (if tests are enabled)
 if(YAZE_BUILD_TESTS)
-  set(IMGUI_TEST_ENGINE_DIR ${CMAKE_SOURCE_DIR}/src/lib/imgui_test_engine/imgui_test_engine)
+  set(IMGUI_TEST_ENGINE_DIR ${CMAKE_SOURCE_DIR}/ext/imgui_test_engine/imgui_test_engine)
   
   if(EXISTS ${IMGUI_TEST_ENGINE_DIR})
     set(IMGUI_TEST_ENGINE_SOURCES
@@ -53,7 +53,7 @@ if(YAZE_BUILD_TESTS)
     target_include_directories(ImGuiTestEngine PUBLIC 
       ${IMGUI_DIR}
       ${IMGUI_TEST_ENGINE_DIR}
-      ${CMAKE_SOURCE_DIR}/src/lib
+      ${CMAKE_SOURCE_DIR}/ext
     )
     target_compile_features(ImGuiTestEngine PUBLIC cxx_std_17)
     target_link_libraries(ImGuiTestEngine PUBLIC ImGui ${YAZE_SDL2_TARGETS})

cmake/dependencies/json.cmake

@@ -4,14 +4,14 @@ if(NOT YAZE_ENABLE_JSON)
   return()
 endif()
 
-message(STATUS "Setting up nlohmann_json with local third_party")
+message(STATUS "Setting up nlohmann_json with local ext directory")
 
-# Use the bundled nlohmann_json from third_party
+# Use the bundled nlohmann_json from ext/json
 set(JSON_BuildTests OFF CACHE BOOL "" FORCE)
 set(JSON_Install OFF CACHE BOOL "" FORCE)
 set(JSON_MultipleHeaders OFF CACHE BOOL "" FORCE)
 
-add_subdirectory(${CMAKE_SOURCE_DIR}/third_party/json EXCLUDE_FROM_ALL)
+add_subdirectory(${CMAKE_SOURCE_DIR}/ext/json EXCLUDE_FROM_ALL)
 
 # Verify target is available
 if(TARGET nlohmann_json::nlohmann_json)
@@ -25,10 +25,7 @@ else()
 endif()
 
 # Export for use in other CMake files
-set(YAZE_JSON_TARGETS
-  nlohmann_json::nlohmann_json
-  PARENT_SCOPE
-)
+set(YAZE_JSON_TARGETS nlohmann_json::nlohmann_json CACHE INTERNAL "nlohmann_json targets")
 
 message(STATUS "nlohmann_json setup complete")