chore: snapshot before HartOMat rebrand

backend/app/api/routers/chat.py

@@ -99,12 +99,21 @@ async def send_message(
         raise HTTPException(status_code=status.HTTP_422_UNPROCESSABLE_ENTITY, detail=str(exc))
     except Exception as exc:
         error_msg = str(exc)
+        error_code = None
         # Extract meaningful error from OpenAI exceptions
         if hasattr(exc, 'message'):
             error_msg = exc.message
-        elif hasattr(exc, 'body') and isinstance(exc.body, dict):
-            error_msg = exc.body.get('error', {}).get('message', error_msg)
+        if hasattr(exc, 'body') and isinstance(exc.body, dict):
+            err = exc.body.get('error', {})
+            error_code = err.get('code')
+            error_msg = err.get('message', error_msg)
         logger.error("Chat error: %s", error_msg)
+        # Content filter violation → return 422 with user-friendly message
+        if error_code == 'content_filter':
+            raise HTTPException(
+                status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+                detail="Deine Nachricht wurde vom Azure Content Filter blockiert. Bitte formuliere sie um.",
+            )
         raise HTTPException(status_code=500, detail=f"AI error: {error_msg[:500]}")
     except Exception as exc:
         logger.exception("Chat error for user %s", user.id)