fix(cmake): standardize exported target name to container_system::container_system (#507)

Change EXPORT_NAME from container to container_system so consumers get
container_system::container_system after find_package(container_system),
following the <package>::<package> convention.

Add container_system::container_system as canonical build-tree alias.
Backward-compatible aliases (container_system::container and
ContainerSystem::container) are preserved for existing consumers.

Part of kcenon/vcpkg-registry#78

Author: kcenon

CMakeLists.txt

@@ -260,13 +260,14 @@ if(BUILD_WITH_COMMON_SYSTEM)
 endif()
 
 # Create aliases for consistent naming and messaging system compatibility
-add_library(container_system::container ALIAS container_system)
+add_library(container_system::container_system ALIAS container_system)  # Canonical <package>::<package>
+add_library(container_system::container ALIAS container_system)  # Backward compatibility
 add_library(ContainerSystem::container ALIAS container_system)  # Backward compatibility
 add_library(MessagingSystem::container ALIAS container_system)  # For messaging system compatibility
 
 # Set target properties
 set_target_properties(container_system PROPERTIES
-    EXPORT_NAME container
+    EXPORT_NAME container_system
     POSITION_INDEPENDENT_CODE ON
     CXX_STANDARD 20
     CXX_STANDARD_REQUIRED ON

cmake/container_system-config.cmake.in

@@ -13,6 +13,11 @@ find_dependency(common_system CONFIG REQUIRED)
 # Include targets
 include("${CMAKE_CURRENT_LIST_DIR}/container_system-targets.cmake")
 
+# Backward compatibility alias (container_system::container → container_system::container_system)
+if(NOT TARGET container_system::container)
+    add_library(container_system::container ALIAS container_system::container_system)
+endif()
+
 # Verify targets exist
 check_required_components(container_system)
 
@@ -22,13 +27,13 @@ set(container_system_FOUND TRUE)
 # Provide information about the package
 set(container_system_VERSION @PROJECT_VERSION@)
 set(container_system_INCLUDE_DIRS "@PACKAGE_CMAKE_INSTALL_INCLUDEDIR@")
-set(container_system_LIBRARIES container_system::container)
+set(container_system_LIBRARIES container_system::container_system)
 
 # Backward compatibility aliases (ContainerSystem:: → container_system::)
 if(NOT TARGET ContainerSystem::container)
     add_library(ContainerSystem::container INTERFACE IMPORTED)
     set_target_properties(ContainerSystem::container PROPERTIES
-        INTERFACE_LINK_LIBRARIES container_system::container
+        INTERFACE_LINK_LIBRARIES container_system::container_system
     )
 endif()