Shop-Topbar: Level/XP/Odds links, Lock rechts; Shine nur bei eigenem Champion

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

backend/tests/test_api.py

@@ -55,8 +55,9 @@ def test_invalid_action_is_400(client):
 def test_state_shape(client):
     state = client.post("/api/game", params={"seed": 5}).json()
     for key in ("round", "player", "board", "bench", "shop", "traits",
-                "opponents", "items", "over", "log"):
+                "opponents", "items", "over", "log", "shop_odds", "shop_locked"):
         assert key in state
+    assert sum(state["shop_odds"]) == 100
     assert state["player"]["score"] == 0.0
     assert all(o["board"] is not None for o in state["opponents"])