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/FileManagement/flm_dtc.h

@@ -1,76 +1,4 @@
 #pragma once
 
-// STUB-HEADER: Diese Datei wird normalerweise von ddsdtc generiert
-// Für die Migration erstellen wir minimale Implementierungen
-
-#include <functional>
-#include <QObject>
-#include "flm_db.h"
-
-namespace FileManagement
-{
-namespace Interface
-{
-
-// DataModification Enum (aus DDS generiert)
-enum class DataModification
-{
-  eAdded,
-  eModified,
-  eRemoved
-};
-
-// Callback types
-using FolderCallback = std::function<void(const std::vector<Folder>&, const std::vector<int32_t>&, DataModification)>;
-using FileContentCallback = std::function<void(const std::vector<FileContent>&, const std::vector<int32_t>&, DataModification)>;
-
-// Dtc - Data Transfer Component interface for FileManagement
-class Dtc : public QObject
-{
-  Q_OBJECT
-  
-public:
-  virtual ~Dtc() = default;
-  
-  // Initialization methods
-  virtual void enableFolder() {}
-  virtual void waitForHistoricalDataFolder() {}
-  virtual void enableFileContent() {}
-  virtual void waitForHistoricalDataFileContent() {}
-  
-  // Folder operations
-  virtual void folders(FolderCallback callback) const
-  {
-    // STUB-Implementierung - keine Ordner vorhanden
-    std::vector<Folder> emptyFolders;
-    std::vector<int32_t> emptyIds;
-    callback(emptyFolders, emptyIds, DataModification::eModified);
-  }
-  
-  virtual std::shared_ptr<Folder> folder(int32_t /*folderId*/) const
-  {
-    return nullptr;
-  }
-  
-  // FileContent operations
-  virtual void fileContents(FileContentCallback callback) const
-  {
-    // STUB-Implementierung
-    std::vector<FileContent> emptyContents;
-    std::vector<int32_t> emptyIds;
-    callback(emptyContents, emptyIds, DataModification::eModified);
-  }
-  
-  virtual std::shared_ptr<FileContent> fileContent(int32_t /*fileContentId*/) const
-  {
-    return nullptr;
-  }
-  
-signals:
-  void folderChanged(const FileManagement::Folder &folder, DataModification modification);
-  void fileContentChanged(const FileManagement::FileContent &fileContent, DataModification modification);
-};
-
-class Ftc;
-} // namespace Interface
-} // namespace FileManagement
+// STUB-HEADER: Include generated file from build directory
+#include <Lts/Proxies/FileManagement/flm_dtc.h>