Fix FileManagement Build-Fehler (BUILD_RTI=OFF)

- flm_db.h: Stub-Header mit Folder/FileContent Klassen erstellt
- flm_enums.hpp: MainFolder Enum hinzugefügt (None=0)
- flm_translation.h: toInt() entfernt, trFolderName() angepasst
- Plugin-Interfaces erstellt (flm, opm, exm)
- Viewer-Dialogs: QString-Konvertierungen behoben
- AdvancedSymbology CMakeLists.txt: Ungültige Pfade entfernt
- ism_mounting_point.cpp: Redundante Definitionen entfernt

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

qt6-after/qt6-migrated-legatus/include/FileManagement/flm_ftc.h

@@ -0,0 +1,20 @@
+/**
+  * @RDE_HEADER@
+  * FileManagement Topic Client Stub (BUILD_RTI=OFF)
+  * Normally generated from flm_service.xml by DDS Code Generator
+  */
+
+#pragma once
+
+#include <memory>
+
+namespace FileManagement
+{
+namespace Interface
+{
+
+// Forward declaration - actual implementation provided by DDS when BUILD_RTI=ON
+class Ftc;
+
+} // namespace Interface
+} // namespace FileManagement