feat: 添加新的错误码以支持投注功能，更新数据库填充器以增强玩法和赔率配置，扩展 API 路由以支持风险池管理

app/Models/TicketCombination.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/** 注项展开组合 {@see ticket_combinations} */
+class TicketCombination extends Model
+{
+    public $timestamps = false;
+
+    protected $fillable = [
+        'ticket_item_id',
+        'combination_no',
+        'number_4d',
+        'bet_amount',
+        'estimated_payout',
+        'created_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'ticket_item_id' => 'integer',
+            'combination_no' => 'integer',
+            'bet_amount' => 'integer',
+            'estimated_payout' => 'integer',
+            'created_at' => 'datetime',
+        ];
+    }
+
+    public function item(): BelongsTo
+    {
+        return $this->belongsTo(TicketItem::class, 'ticket_item_id');
+    }
+}