feat: 增强开奖与设置控制器的币种支持功能

引入 CurrencyResolver，用于在 DrawCurrentController、DrawResultShowController 与 DrawResultsIndexController 中统一处理币种代码解析。
更新 DrawHallSnapshotBuilder 与 DrawResultViewService 的构建方法，新增币种代码参数支持，确保开奖相关功能中的币种处理一致性。
增强 SettingIndexController：新增允许访问的 KV 配置分组校验。
在 OddsStreamService、PlayConfigStreamService 与 RiskCapStreamService 中新增广播功能，用于在玩法目录变更时推送更新通知。
新增测试用例，验证风险限额发布的广播行为。

app/Services/Draw/DrawHallSnapshotBuilder.php

@@ -199,9 +199,10 @@ final class DrawHallSnapshotBuilder
     /**
      * @return array<string, mixed>|null
      */
-    public function build(?Carbon $nowUtc = null): ?array
+    public function build(?Carbon $nowUtc = null, ?string $currencyCode = null): ?array
     {
         $nowUtc = ($nowUtc ?? Carbon::now())->utc();
+        $currencyCode = $this->normalizeCurrencyCode($currencyCode);
 
         $target = $this->resolveHallTarget($nowUtc);
 
@@ -255,7 +256,8 @@ final class DrawHallSnapshotBuilder
             'seconds_to_draw' => $secsToDraw,
             'cooling_end_time' => $target->cooling_end_time?->toIso8601String(),
             'seconds_remaining_in_cooldown' => $coolingRemain,
-            'jackpot' => $this->jackpotSummary->summary('NPR'),
+            'jackpot_currency_code' => $currencyCode,
+            'jackpot' => $this->jackpotSummary->summary($currencyCode),
         ];
 
         $riskAlerts = RiskPool::query()
@@ -320,4 +322,15 @@ final class DrawHallSnapshotBuilder
 
         return $payload;
     }
+
+    private function normalizeCurrencyCode(?string $currencyCode): string
+    {
+        $code = strtoupper(substr(trim((string) ($currencyCode ?? '')), 0, 16));
+
+        if ($code !== '') {
+            return $code;
+        }
+
+        return strtoupper(substr(trim((string) config('lottery.default_currency', 'NPR')), 0, 16));
+    }
 }