refactor: 迁移彩票设置至 LotterySettings 服务

- 更新多个控制器和服务，使用 LotterySettings 服务获取彩票相关配置，如默认币种、开奖间隔、下注窗口等，提升代码一致性与可维护性。
- 移除 .env.example 中不再使用的配置项，建议通过后台管理进行设置。

app/Console/Commands/LotteryPerfDrawScheduleAuditCommand.php

@@ -5,6 +5,7 @@ namespace App\Console\Commands;
 use App\Models\Draw;
 use Carbon\Carbon;
 use Illuminate\Console\Command;
+use App\Services\LotterySettings;
 use App\Services\Draw\DrawPlannerService;
 
 /**
@@ -22,7 +23,7 @@ final class LotteryPerfDrawScheduleAuditCommand extends Command
     {
         $samples = max(2, (int) $this->option('samples'));
         $tolerance = max(0, (int) $this->option('tolerance-seconds'));
-        $intervalMinutes = (int) config('lottery.draw.interval_minutes', 5);
+        $intervalMinutes = LotterySettings::drawIntervalMinutes();
         $expectedSeconds = $intervalMinutes * 60;
 
         $planner->ensureBuffer(Carbon::now('UTC'));