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.

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

qt6-after/qt6-migrated-legatus/.forward-declarations/include/ExerciseManagement/exm_dtc.h

@@ -1,119 +1,4 @@
 #pragma once
 
-// STUB-HEADER: Diese Datei wird normalerweise von ddsdtc generiert
-// Für die Migration erstellen wir minimale Typ-Definitionen
-
-#include "exm_exercise.h"
-#include "ParticipantManagement/ppm_enums.hpp"
-#include "FileManagement/flm_db.h"
-
-#include <QtCore/QObject>
-#include <QtCore/QList>
-#include <functional>
-#include <vector>
-#include <string>
-
-namespace ExerciseManagement
-{
-
-// ExercisePhase struct
-struct ExercisePhase
-{
-  [[nodiscard]] int id() const { return m_id; }
-  [[nodiscard]] std::string name() const { return m_name; }
-  
-  int m_id = 0;
-  std::string m_name;
-};
-
-namespace Interface
-{
-
-// Dtc - Data Transfer Component für Exercise Management
-class Dtc : public QObject {
-  Q_OBJECT
-  
-public:
-  Dtc() = default;
-  ~Dtc() override = default;
-  
-  // Initialization methods
-  void enableExercise() {}
-  void waitForHistoricalDataExercise() {}
-  void enableExercisePhase() {}
-  void waitForHistoricalDataExercisePhase() {}
-  
-  // Exercise-Liste abrufen (Callback-basiert)
-  void exercises(const std::function<void(const Exercise&)>& callback) const {
-    for (const auto& ex : m_exercises) {
-      callback(ex);
-    }
-  }
-  
-  // Einzelnes Exercise nach ID abrufen
-  Exercise exercise(int id) const {
-    for (const auto& ex : m_exercises) {
-      if (ex.id == id) {
-        return ex;
-      }
-    }
-    return Exercise{}; // Return empty exercise if not found
-  }
-  
-  // Exercise-Phase nach ID abrufen
-  ExercisePhase exercisePhase(int phaseId) const {
-    for (const auto& phase : m_phases) {
-      if (phase.m_id == phaseId) {
-        return phase;
-      }
-    }
-    return ExercisePhase{}; // Return empty phase if not found
-  }
-  
-  // Folders abrufen (Callback-basiert) - benötigt von LtsFileDialog
-  void folders(const std::function<void(const std::vector<FileManagement::Folder>&)>& callback) const {
-    callback(m_folders);
-  }
-  
-  // Exercise-Liste als QList
-  QList<Exercise> exercisesList() const { return m_exercises; }
-  
-  // Exercise hinzufügen/entfernen/ändern
-  void addExercise(const Exercise& ex) { 
-    m_exercises.append(ex); 
-    emit exerciseChanged(ex, ParticipantManagement::DataModification::eAdded);
-  }
-  
-  void updateExercise(const Exercise& ex) {
-    for (auto& existing : m_exercises) {
-      if (existing.id == ex.id) {
-        existing = ex;
-        emit exerciseChanged(ex, ParticipantManagement::DataModification::eModified);
-        return;
-      }
-    }
-    addExercise(ex);
-  }
-  
-  void removeExercise(int id) {
-    for (auto it = m_exercises.begin(); it != m_exercises.end(); ++it) {
-      if (it->id == id) {
-        Exercise removed = *it;
-        m_exercises.erase(it);
-        emit exerciseChanged(removed, ParticipantManagement::DataModification::eRemoved);
-        return;
-      }
-    }
-  }
-  
-signals:
-  void exerciseChanged(const Exercise& exercise, ParticipantManagement::DataModification modificationType);
-  
-private:
-  QList<Exercise> m_exercises;
-  std::vector<ExercisePhase> m_phases;
-  std::vector<FileManagement::Folder> m_folders;
-};
-
-} // namespace Interface
-} // namespace ExerciseManagement
+// STUB-HEADER: Include generated file from build directory
+#include <Lts/Proxies/ExerciseManagement/exm_dtc.h>