feat(tournaments): league table, games-based scoring, no draws, byes without points, withdraw players

[dinooo13]

Summary

Tester feedback (Sept 2026) on round-robin tournaments.

• Results are only 2:0, 2:1, 1:2 or 0:2; there are no draws.
• A 2:0 scores more than a 2:1.
• Byes give no points by default.
• Round robin shows a football-style league table instead of the OMW%/GW%/OGW% percentages.
• The organizer can take a player out of the standings (Kickertool approach).

Roadmap phase / item

Phase 7 (Turniere), "Tester-Feedback Sept 2026".

Changes

• Results
  • Quick buttons 2:0, 2:1, 1:2, 0:2; the "Unentschieden" (draw) button is removed.
  • Equal scores are rejected in the UI and by the server (draws_not_allowed).
  • Legacy draws are still scored.
• Scoring (tournament.scoring)
  • games: 3 for a 2:0 win, 2 for a 2:1 win, 1 for a 1:2 loss, 0 for a 0:2 loss. Default for new tournaments.
  • match: classic 3/0.
  • OMW% stays meaningful under both.
• Byes (tournament.bye_scoring): none (default: no points, not a played match, shown as "Spielfrei") or win (the old 2:0).
• Round robin standings
  • League table with Pl., Sp., S, N, Spiele, Diff., Pkt.
  • Order: points → game difference → head-to-head (exactly two level) → games won → seed.
  • Rounds are labelled "Spieltag n", and there is a crosstable view.
  • Swiss keeps OMW%, GW% and OGW%.
• "Aus der Wertung nehmen" (tournament_participant.withdrawn)
  • Every match with the player, past and future, is left out of everyone's standings, and their open match is voided.
  • The player is listed last. It can be undone while the tournament runs.
  • Withdrawing wins over dropping: if the player is also dropped, their fixtures are not turned into scoring byes.
• Pairing swaps are disabled for round robin (pairings_fixed), because they broke the fixed schedule.
• Settings: scoring and bye scoring are chosen at creation and can be edited during registration.
• Migration 0018
  • Adds the three columns.
  • Backfills existing tournaments to match/win, so their points don't change.
  • Existing round robins now use the league tiebreakers, so the order among players level on points can change (noted in the ADR).
• Docs: ADR 0028; ADR 0008 is marked partially superseded; DEVELOPMENT.md "Turniere" and the Roadmap are updated.

Test plan

• CI gates pass locally:
  • pnpm lint, pnpm typecheck, pnpm typecheck:e2e
  • pnpm test: 1860 tests
  • pnpm test:e2e: 139 on the main commit; the follow-up fix re-ran e2e/tournaments.spec.ts
• Tests added/updated:
  • scoring and tiebreakers
  • withdrawing, and dropped + withdrawn
  • full round-robin API run
  • migration backfill
  • new round-robin E2E
  • old draw/bye expectations updated
• Docs/ADR updated

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