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/JackpotContribution.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/** 单注对 Jackpot 的蓄水 {@see jackpot_contributions} */
+class JackpotContribution extends Model
+{
+    protected $fillable = [
+        'jackpot_pool_id',
+        'draw_id',
+        'player_id',
+        'ticket_item_id',
+        'contribution_amount',
+        'currency_code',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'jackpot_pool_id' => 'integer',
+            'draw_id' => 'integer',
+            'player_id' => 'integer',
+            'ticket_item_id' => 'integer',
+            'contribution_amount' => 'integer',
+        ];
+    }
+
+    public function pool(): BelongsTo
+    {
+        return $this->belongsTo(JackpotPool::class, 'jackpot_pool_id');
+    }
+
+    public function draw(): BelongsTo
+    {
+        return $this->belongsTo(Draw::class);
+    }
+
+    public function player(): BelongsTo
+    {
+        return $this->belongsTo(Player::class);
+    }
+
+    public function ticketItem(): BelongsTo
+    {
+        return $this->belongsTo(TicketItem::class, 'ticket_item_id');
+    }
+}