Update version to 0.8.146 and add changelog entry for new features

- Incremented app version to 0.8.146 and updated changelog to include the new version details.
- Documented the addition of the publish-to-framework feature for training units, enhancing the training planning capabilities.

backend/version.py

@@ -43,6 +43,8 @@ CHANGELOG = [
             "Planung: Liste – Rahmen-Session & Übungen→Modul; Dialog Modul aus Einheit; klarere Rahmen-Unit-ID aus Liste",
         ],
     },
+    {
+        "version": "0.8.146",
         "date": "2026-05-19",
         "changes": [
             "Planung: Trainingseinheit → Rahmenprogramm (Session-Slot) speichern; API POST /api/training-units/{id}/publish-to-framework",