feat: 增强管理员权限管理，添加 RBAC 支持，更新 AdminUser 模型以处理角色和权限，更新登录接口返回权限信息，扩展数据库填充器以同步角色权限

app/Models/ReconcileItem.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class ReconcileItem extends Model
+{
+    protected $table = 'reconcile_items';
+
+    protected $fillable = [
+        'reconcile_job_id',
+        'side_a_ref',
+        'side_b_ref',
+        'difference_amount',
+        'status',
+        'resolved_at',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'difference_amount' => 'integer',
+            'resolved_at' => 'datetime',
+        ];
+    }
+
+    /** @return BelongsTo<ReconcileJob, ReconcileItem> */
+    public function reconcileJob(): BelongsTo
+    {
+        return $this->belongsTo(ReconcileJob::class, 'reconcile_job_id');
+    }
+}