Fix profit_gold API for gold apps without orders relation eager load.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Models/Customer.php

@@ -91,6 +91,12 @@ class Customer extends Authenticatable implements JWTSubject
     {
         return $this->hasMany(Wallet::class ,'owner')->with(['fund','product'])->select(['cash', 'fund_id','product_id','gold', 'owner']);
     }
+
+    public function orders()
+    {
+        return $this->hasMany(Order::class, 'customer_id');
+    }
+
     public function user()
     {
         return $this->belongsTo(User::class)->select(['id','name']);