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/SettlementBatch.php

@@ -0,0 +1,60 @@
+<?php
+
+namespace App\Models;
+
+use App\Lottery\SettlementBatchStatus;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+/** 单期单次结算批次 {@see settlement_batches} */
+class SettlementBatch extends Model
+{
+    protected $fillable = [
+        'draw_id',
+        'result_batch_id',
+        'settle_version',
+        'status',
+        'total_ticket_count',
+        'total_win_count',
+        'total_payout_amount',
+        'total_jackpot_payout_amount',
+        'started_at',
+        'finished_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'draw_id' => 'integer',
+            'result_batch_id' => 'integer',
+            'settle_version' => 'integer',
+            'total_ticket_count' => 'integer',
+            'total_win_count' => 'integer',
+            'total_payout_amount' => 'integer',
+            'total_jackpot_payout_amount' => 'integer',
+            'started_at' => 'datetime',
+            'finished_at' => 'datetime',
+        ];
+    }
+
+    public function draw(): BelongsTo
+    {
+        return $this->belongsTo(Draw::class);
+    }
+
+    public function resultBatch(): BelongsTo
+    {
+        return $this->belongsTo(DrawResultBatch::class, 'result_batch_id');
+    }
+
+    public function details(): HasMany
+    {
+        return $this->hasMany(TicketSettlementDetail::class, 'settlement_batch_id');
+    }
+
+    public function statusEnum(): ?SettlementBatchStatus
+    {
+        return SettlementBatchStatus::tryFrom((string) $this->status);
+    }
+}