feat: C2C商家交易系统后端 — API+后台管理

app/C2cMerchantOrder.php

@@ -0,0 +1,16 @@
+<?php
+namespace App;
+use Illuminate\Database\Eloquent\Model;
+
+class C2cMerchantOrder extends Model
+{
+    protected $table = 'c2c_merchant_order';
+    protected $fillable = [
+        'order_no','user_id','merchant_id','direction','crypto_currency','fiat_currency',
+        'amount','unit_price','total_price','fee','fee_rate','status',
+        'contact_type','contact_link','expire_time'
+    ];
+
+    public function merchant() { return $this->belongsTo(C2cMerchant::class, 'merchant_id'); }
+    public function user() { return $this->belongsTo(Users::class, 'user_id'); }
+}