Branding CopyDev complet — splash screen, A propos, statusbar

- Splash screen au demarrage (fond sombre, logo CopyDev, nom, coordonnees)
- Statut dans le splash : licence, mise a jour, chargement
- A propos refait : design sombre pro, logo 150px, version, description,
  coordonnees completes (email, web, tel), copyright
- Barre de titre : "CopyDev Imposing Tool vX.X.X — www.copydev.fr"
- Barre de statut : mention "CopyDev — contact@copydev.fr" permanente

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

main.py

@@ -188,9 +188,17 @@ def main():
     if os.path.exists(icon_path):
         app.setWindowIcon(QIcon(icon_path))
 
+    # Splash screen
+    from app.splash import SplashScreen
+    splash = SplashScreen()
+    splash.show()
+    QApplication.processEvents()
+
+    splash.set_status("Verification de la licence...")
     if not _check_license():
         sys.exit(1)
 
+    splash.set_status("Recherche de mises a jour...")
     # Verification de mise a jour silencieuse
     from app.updater import check_for_update, VERSION
     update_available, remote_version = check_for_update()
@@ -211,9 +219,11 @@ def main():
             else:
                 QMessageBox.warning(None, "Mise a jour", f"Echec de la mise a jour :\n{msg}")
 
+    splash.set_status("Chargement de l'interface...")
     from app.main_window import MainWindow
     window = MainWindow()
     window.show()
+    splash.close()
     sys.exit(app.exec())