feat: 添加结算功能，更新 TicketItem 模型以支持最新结算详情，增强 DrawTickService 以自动处理结算，更新 TicketWalletService 以支持派彩入账，扩展 API 路由以管理结算批次和奖池

app/Http/Controllers/Api/V1/Admin/Settlement/AdminSettlementBatchShowController.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1\Admin\Settlement;
+
+use App\Http\Controllers\Controller;
+use App\Models\SettlementBatch;
+use App\Support\ApiResponse;
+use Illuminate\Http\JsonResponse;
+
+/**
+ * GET /api/v1/admin/settlement-batches/{batch} — 单批次摘要。
+ */
+final class AdminSettlementBatchShowController extends Controller
+{
+    public function __invoke(SettlementBatch $batch): JsonResponse
+    {
+        $batch->load(['draw:id,draw_no,business_date,status', 'resultBatch:id,result_version,status']);
+
+        return ApiResponse::success([
+            'id' => (int) $batch->id,
+            'draw_id' => (int) $batch->draw_id,
+            'draw_no' => $batch->draw?->draw_no,
+            'draw_status' => $batch->draw?->status,
+            'result_batch_id' => (int) $batch->result_batch_id,
+            'result_batch_version' => $batch->resultBatch?->result_version,
+            'result_batch_status' => $batch->resultBatch?->status,
+            'settle_version' => (int) $batch->settle_version,
+            'status' => $batch->status,
+            'total_ticket_count' => (int) $batch->total_ticket_count,
+            'total_win_count' => (int) $batch->total_win_count,
+            'total_payout_amount' => (int) $batch->total_payout_amount,
+            'total_jackpot_payout_amount' => (int) $batch->total_jackpot_payout_amount,
+            'started_at' => $batch->started_at?->toIso8601String(),
+            'finished_at' => $batch->finished_at?->toIso8601String(),
+            'created_at' => $batch->created_at?->toIso8601String(),
+        ]);
+    }
+}