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/Models/JackpotPool.php

@@ -0,0 +1,47 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+/** Jackpot 奖池配置与当前水位 {@see jackpot_pools} */
+class JackpotPool extends Model
+{
+    protected $fillable = [
+        'currency_code',
+        'current_amount',
+        'contribution_rate',
+        'trigger_threshold',
+        'payout_rate',
+        'force_trigger_draw_gap',
+        'min_bet_amount',
+        'status',
+        'last_trigger_draw_id',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'current_amount' => 'integer',
+            'contribution_rate' => 'decimal:4',
+            'trigger_threshold' => 'integer',
+            'payout_rate' => 'decimal:4',
+            'force_trigger_draw_gap' => 'integer',
+            'min_bet_amount' => 'integer',
+            'status' => 'integer',
+            'last_trigger_draw_id' => 'integer',
+        ];
+    }
+
+    public function lastTriggerDraw(): BelongsTo
+    {
+        return $this->belongsTo(Draw::class, 'last_trigger_draw_id');
+    }
+
+    public function contributions(): HasMany
+    {
+        return $this->hasMany(JackpotContribution::class, 'jackpot_pool_id');
+    }
+}