Merge feature/qt6-migration-basis-modules-merge-viewer-validation into feature/migrate-lts-projects-and-application

Cherry-picks 5501d1e50 (stub-header updates, superseded by 4223ca2ff relocation); resolves 1 content + 24 modify/delete conflicts; validates BUILD_RTI=ON BUILD_GRANTLEE=ON incl. Tools Groups 6-11.

qt6-after/qt6-migrated-legatus/forward-declarations/Lts/Services/ExerciseEventManagement/eem_dtc.h

@@ -0,0 +1,4 @@
+#pragma once
+
+// STUB-HEADER: Include generated file from build directory
+#include <Lts/Proxies/ExerciseEventManagement/eem_dtc.h>

qt6-after/qt6-migrated-legatus/forward-declarations/Lts/Services/ExerciseEventManagement/eem_ftc.h

@@ -0,0 +1,17 @@
+#ifndef EEM_FTC_H
+#define EEM_FTC_H
+
+// Stub file for eem_ftc.h - generated code placeholder
+// This file is auto-generated from eem_service.xml when BUILD_GRANTLEE=ON
+// For BUILD_GRANTLEE=OFF, this stub allows compilation to proceed
+
+namespace ExerciseEventManagement {
+namespace Dds {
+
+// Forward declarations - actual definitions in generated code
+class Ftc;
+
+} // namespace Dds
+} // namespace ExerciseEventManagement
+
+#endif // EEM_FTC_H