first version

app/Models/ProductModel.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+/**
+ * 商品档案模型（品名/规格包规/供应商/等级/多等级价格体系）
+ */
+class ProductModel extends Model
+{
+    use SoftDeletes, HasFactory;
+
+    /** 状态：下架 */
+    public const STATUS_OFF = 0;
+    /** 状态：上架 */
+    public const STATUS_ON = 1;
+
+    protected $table = 'product';
+    protected $primaryKey = 'id';
+
+    protected $fillable = [
+        'category_id',
+        'supplier_id',
+        'name',
+        'spec',
+        'grade',
+        'unit',
+        'image',
+        'sort',
+        'status',
+        'remark',
+    ];
+
+    protected $casts = [
+        'category_id' => 'integer',
+        'supplier_id' => 'integer',
+        'sort' => 'integer',
+        'status' => 'integer',
+    ];
+
+    /**
+     * 所属分类
+     */
+    public function category(): BelongsTo
+    {
+        return $this->belongsTo(ProductCategoryModel::class, 'category_id', 'id');
+    }
+
+    /**
+     * 供货供应商
+     */
+    public function supplier(): BelongsTo
+    {
+        return $this->belongsTo(SupplierModel::class, 'supplier_id', 'id');
+    }
+
+    /**
+     * 多等级价格（同一商品按客户等级定价）
+     */
+    public function prices(): HasMany
+    {
+        return $this->hasMany(ProductPriceModel::class, 'product_id', 'id');
+    }
+}