feat: Organize CMakeLists for modular source management across main components

main/ui/apps/CMakeLists.txt

@@ -0,0 +1,19 @@
+# Control which apps are included in the build.
+# Override `ENABLED_APPS` from the top-level CMake command line to change apps.
+if(NOT DEFINED ENABLED_APPS)
+    set(ENABLED_APPS "iotdis")
+    endif()
+message(STATUS "Enabled apps: ${ENABLED_APPS}")
+
+foreach(app IN LISTS ENABLED_APPS)
+    set(APP_DIR "${CMAKE_CURRENT_LIST_DIR}/${app}")
+    if(EXISTS "${APP_DIR}/CMakeLists.txt")
+        include("${APP_DIR}/CMakeLists.txt")
+    else()
+        message(WARNING "App '${app}' has no CMakeLists.txt — attempting to add any sources directly")
+        file(GLOB APP_SRCS "${APP_DIR}/*.c" "${APP_DIR}/*.cpp" "${APP_DIR}/*/*.c" "${APP_DIR}/*/*.cpp")
+        if(APP_SRCS)
+            list(APPEND SRCS ${APP_SRCS})
+        endif()
+    endif()
+endforeach()