Forfeit = 2x coin loss + 0 XP (no kot); end-of-game roster + add friend

Forfeit penalty reworked (client + server gamification, in sync):
- Surrendering team loses DOUBLE the entry coins; winner takes the stake.
- Forfeiter earns NO XP. No kot is applied or mentioned anymore.
- MatchSummary/Dto carry a `forfeit` flag; GameRoom.FinalizeForfeit →
  ApplyRewardsAsync(team) with Forfeit=true (dropped the kot path).
- Forfeit confirm dialogs now alert the real penalty (double coins, no XP).

End-of-game roster: SeatPlayerDto/ServerSeatPlayer + game-store SeatPlayer gain
userId/isBot. New <MatchPlayersList> lists everyone at the table on the final
screen (PostMatchRewardsModal + AI MatchOverlay) with a tactile "Add" button to
send a friend request to real (non-bot, non-self) players ("Sent" after).

Verified: tsc + sim + dotnet + next build clean; stack rebuilt :1500/:1505.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/components/screens/GameScreen.tsx

@@ -75,15 +75,15 @@ export function GameScreen() {
         stake: meta.stake,
         won: game.matchWinner === 0,
         kotFor: tally.kotFor,
-        // Forfeiting with 0 rounds won = a Kot loss.
-        kotAgainst: tally.kotAgainst || (forfeited && game.matchScore[0] === 0),
+        kotAgainst: tally.kotAgainst,
         tricksWon: tally.tricksTeam0,
         rounds: game.matchScore[0] + game.matchScore[1],
         trump: game.trump,
         // shutout = you won and the opponent never scored a round (e.g. 7–0)
-        shutout: game.matchWinner === 0 && game.matchScore[1] === 0,
+        shutout: !forfeited && game.matchWinner === 0 && game.matchScore[1] === 0,
         hakemRounds: tally.hakemRounds,
         roundsWon: game.matchScore[0],
+        forfeit: forfeited,
       };
       getService()
         .submitMatchResult(summary)