refactor：拆分 API 路由与请求校验，统一 final 类和代码风格

app/Services/Ticket/TicketPlacementService.php

@@ -2,16 +2,16 @@
 
 namespace App\Services\Ticket;
 
-use App\Exceptions\TicketOperationException;
-use App\Lottery\DrawStatus;
-use App\Lottery\ErrorCode;
 use App\Models\Draw;
 use App\Models\Player;
-use App\Models\TicketCombination;
+use App\Lottery\ErrorCode;
 use App\Models\TicketItem;
+use App\Lottery\DrawStatus;
 use App\Models\TicketOrder;
-use App\Services\Jackpot\JackpotContributionService;
+use App\Models\TicketCombination;
 use Illuminate\Support\Facades\DB;
+use App\Exceptions\TicketOperationException;
+use App\Services\Jackpot\JackpotContributionService;
 
 final class TicketPlacementService
 {