BUILD_RTI guards: svcTabCommon export header + GuezMinelayerProcessing stubs

- TrainingAreaBase/CMakeLists.txt: Wrap RTIDDSGEN with BUILD_RTI, add fallback target
- GuezMinelayerProcessing: BUILD_RTI guards for HandlerMinelayerData + stubs
- ddsfts/CMakeLists.txt: Fix INTERFACE→PUBLIC, add svcTabCommon dependency
- Add stub headers for BUILD_RTI=OFF compilation

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/Lts/Services/GuezMinelayerProcessing/dds_handler.cpp

@@ -24,7 +24,6 @@ DdsHandler::DdsHandler(const std::shared_ptr<DDSConnector::DdsConnector> &ddsCon
 #else
 DdsHandler::DdsHandler()
   : m_logger(getNGLLogger("GuezMinelayerProcessing.DdsHandler"))
-  , m_topicLockMaster(std::make_shared<Core::TopicLockMaster>())
 {
   DEBUG_LOG(m_logger) << "DdsHandler() - RTI DDS not enabled";
 }