fix: show correct "Game X of 7" for future playoff dates

Enrich raw score-endpoint games with gameNumber from the series cache
before parsing. The score API omits gameNumber and its seriesStatus
reflects current wins, so all future games in a series computed the
same number. Now we cross-reference by game id against the cached
series-detail endpoint which includes the correct gameNumber per game.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/playoff.py

@@ -158,8 +158,6 @@ def series_badges(game):
 
 def series_summary(game):
     """Short line rendered above the card, e.g. 'Game 2 of 7'."""
-    if game.get("gameState") == "FUT":
-        return ""
     state = series_state(game.get("seriesStatus", {}))
     return f"Game {_game_number(game, state)} of 7"