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/Support/CurrencyFormatter.php

@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 namespace App\Support;
 
+use App\Services\LotterySettings;
+
 /**
  * 将「最小货币单位」整数格式化为展示用字符串（不改变业务数字，仅格式化）。
  *
@@ -22,9 +24,9 @@ final class CurrencyFormatter
 
     private static function formatMinorInt(int $minorUnits): string
     {
-        $decimals = max(0, min(12, (int) config('lottery.ui.format.currency.decimals', 2)));
-        $decSep = (string) config('lottery.ui.format.currency.decimal_separator', '.');
-        $thousandsSep = (string) config('lottery.ui.format.currency.thousands_separator', ',');
+        $decimals = LotterySettings::currencyDisplayDecimals();
+        $decSep = LotterySettings::currencyDecimalSeparator();
+        $thousandsSep = LotterySettings::currencyThousandsSeparator();
 
         $divisor = (int) max(1, 10 ** $decimals);
         $negative = $minorUnits < 0;

app/Support/CurrencyResolver.php

@@ -7,6 +7,7 @@ namespace App\Support;
 use App\Models\Player;
 use App\Models\Currency;
 use Illuminate\Http\Request;
+use App\Services\LotterySettings;
 
 /**
  * 币种码解析工具。
@@ -36,7 +37,7 @@ final class CurrencyResolver
         } else {
             $fallback = $default
                 ?? $player?->default_currency
-                ?? config('lottery.default_currency', 'NPR');
+                ?? LotterySettings::defaultCurrency();
             $code = strtoupper(substr(trim((string) $fallback), 0, 16));
         }
 

app/Support/TicketItemListFilters.php

@@ -3,6 +3,7 @@
 namespace App\Support;
 
 use Carbon\Carbon;
+use App\Services\LotterySettings;
 use Illuminate\Database\Eloquent\Builder;
 
 /**
@@ -40,7 +41,7 @@ trait TicketItemListFilters
 
     private function scheduleTimezone(): string
     {
-        return (string) config('lottery.draw.timezone', 'UTC');
+        return LotterySettings::drawTimezone();
     }
 
     private function scheduleDateStartUtc(string $ymd): Carbon