XP-System korrigiert: Level 2 gratis nach erster Welle, 1-1-Carousel-XP banken

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backend/tests/test_constants.py

@@ -19,8 +19,8 @@ def test_shop_odds_shape(c):
 
 
 def test_xp_reaches_max_level(c):
-    start = c["xp"].get("start_level", 1)
-    assert len(c["xp"]["to_next"]) == c["xp"]["max_level"] - start
+    # Level 1 -> 2 ist gratis; to_next deckt 2->3 bis 9->10.
+    assert len(c["xp"]["to_next"]) == c["xp"]["max_level"] - 2
     assert all(x > 0 for x in c["xp"]["to_next"])