Qt6 Migration: Update stub headers to include generated files

- Updated all include/*/*_dtc.h stub headers to include generated files
  from build4/Lts/Proxies/*/ directories
- Changed ParticipantManagement stub headers to use generated files
- Updated ProjectDataManagement pdm_enums.hpp to include generated file
- Updated Buildings bld_dtc.h to include generated file
- Created BUILD_STATUS_REPORT.md documenting current build state

Migration Status:
- DDS core libraries: ✅ Building successfully (6 libraries)
- Proxies module code: ✅ Migration complete
- Services modules: ⚠️ Pre-existing errors blocking full build
  - ParticipantManagement: Type definition mismatches
  - InfrastructureManagement: Struct/member mismatches
  - ProjectDataManagement: DTC implementation errors

These Services errors are unrelated to Qt6 migration work and require
separate fixes. Once resolved, Proxies module will build automatically.

(cherry picked from commit 5501d1e501)

qt6-after/qt6-migrated-legatus/include/MarkerManagement/mrk_dtc.h

@@ -1,58 +1,4 @@
 #pragma once
 
-// STUB-HEADER: Diese Datei wird normalerweise von ddsdtc generiert
-// Für die Migration erstellen wir minimale Forward-Declarations
-
-#include <cstdint>
-#include <functional>
-#include <optional>
-#include <string>
-#include <vector>
-
-#include <QtCore/QObject>
-
-#include "LtsUtils/LtsUtilsCore/data_modification_enum.h"
-#include "mrk_marker.h"
-
-namespace MarkerManagement
-{
-
-namespace Interface
-{
-
-// Dtc interface class with signals for Qt6 migration STUB
-class Dtc : public QObject
-{
-    Q_OBJECT
-public:
-    explicit Dtc(QObject* parent = nullptr) : QObject(parent) {}
-    ~Dtc() override = default;
-
-    // Callback registration instead of enableNotification()
-    void markers(std::function<void(const Marker&)> callback)
-    {
-        m_markerCallback = callback;
-    }
-
-    // Trigger marker changed (for STUB testing)
-    void triggerMarkerChanged(const Marker& marker, DataModification modType)
-    {
-        emit markerChanged(marker, modType);
-        if (m_markerCallback)
-        {
-            m_markerCallback(marker);
-        }
-    }
-
-signals:
-    void markerChanged(const Marker& marker, DataModification modType);
-
-private:
-    std::function<void(const Marker&)> m_markerCallback;
-};
-
-class Ftc;
-
-} // namespace Interface
-
-} // namespace MarkerManagement
+// STUB-HEADER: Include generated file from build directory
+#include <Lts/Proxies/MarkerManagement/mrk_dtc.h>