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/Jackpot/JackpotSummaryController.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1\Jackpot;
+
+use App\Http\Controllers\Controller;
+use App\Models\JackpotPool;
+use App\Support\ApiResponse;
+use Illuminate\Http\JsonResponse;
+use Illuminate\Http\Request;
+
+/**
+ * `GET /api/v1/jackpot/summary` — 当前奖池水位（公开；玩家端开奖区展示）。
+ */
+class JackpotSummaryController extends Controller
+{
+    public function __invoke(Request $request): JsonResponse
+    {
+        $currency = strtoupper(trim((string) $request->query('currency_code', 'NPR')));
+        if (strlen($currency) > 16) {
+            $currency = 'NPR';
+        }
+
+        $pool = JackpotPool::query()
+            ->where('currency_code', $currency)
+            ->where('status', 1)
+            ->first();
+
+        return ApiResponse::success([
+            'currency_code' => $currency,
+            'enabled' => $pool !== null,
+            'current_amount_minor' => $pool !== null ? (int) $pool->current_amount : 0,
+        ]);
+    }
+}