Exclude unplayed 0:0 matches from round-robin standings

[Copilot]

Fresh round-robin tournaments currently show every assigned-but-unplayed match as a 0:0 draw, inflating draws/points and making standings misleading until all games are completed. This change treats default 0:0 as “no result yet” for ranking/statistics calculation.

• Ranking calculation update

  • Added a match-result guard in backend ranking logic.
  • determine_ranking_for_stage_item(...) now excludes definitive matches that still have default 0-0 scores.

• Behavioral effect

  • Unplayed scheduled matches no longer contribute to wins/draws/losses/points in standings.
  • Played matches with non-default scores continue to be counted as before.

• Focused unit coverage

  • Added a round-robin unit test that includes one unplayed 0-0 match and one played match, asserting only the played match affects team statistics.

def match_has_result(match: MatchWithDetailsDefinitive) -> bool:
    return not (match.stage_item_input1_score == 0 and match.stage_item_input2_score == 0)

matches = [
    match
    for round_ in stage_item.rounds
    if not round_.is_draft
    for match in round_.matches
    if isinstance(match, MatchWithDetailsDefinitive)
    if match_has_result(match)
]

• Context screenshot
  • Reported issue example: https://github.com/user-attachments/assets/aa813da5-f561-48fa-9894-c679866d3e79

Warning

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