feat: add coin private table

lib/feature/game/presentation/bloc/game_state.dart

@@ -19,6 +19,7 @@ class TableLobby {
   final int youSeat; // جایگاهِ مطلقِ خودِ کاربر (برای چیدمانِ صحنه)
   final int remaining;
   final bool unlimited;
+  final int stake; // شرطِ سکه‌ایِ هر بازیکن (۰ یعنی رایگان)
   const TableLobby({
     required this.code,
     required this.players,
@@ -26,6 +27,7 @@ class TableLobby {
     required this.youSeat,
     required this.remaining,
     required this.unlimited,
+    required this.stake,
   });
 
   factory TableLobby.fromJson(Map<String, dynamic> j) => TableLobby(
@@ -41,9 +43,10 @@ class TableLobby {
         youSeat: (j['you_seat'] ?? 0) as int,
         remaining: (j['remaining'] ?? 0) as int,
         unlimited: (j['unlimited'] ?? false) as bool,
+        stake: (j['stake'] ?? 0) as int,
       );
 
-  String get sig => '$code|$isHost|$youSeat|$remaining|$unlimited|'
+  String get sig => '$code|$isHost|$youSeat|$remaining|$unlimited|$stake|'
       '${players.map((p) => '${p.name}${p.host ? '*' : ''}@${p.seat}').join(',')}';
 }