feat: 假单列表全局2分钟打乱一次，全用户顺序一致

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

orders/migrations/0012_fakegrabordershufflestate.py

@@ -0,0 +1,23 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('orders', '0011_fakegraborder_merchantnickname'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='FakeGrabOrderShuffleState',
+            fields=[
+                ('id', models.PositiveSmallIntegerField(default=1, primary_key=True, serialize=False, verbose_name='固定主键=1')),
+                ('LastShuffleTime', models.DateTimeField(verbose_name='上次打乱时刻')),
+                ('IntervalSeconds', models.PositiveIntegerField(default=120, verbose_name='打乱间隔秒数（默认2分钟）')),
+                ('UpdateTime', models.DateTimeField(auto_now=True, verbose_name='更新时间')),
+            ],
+            options={
+                'db_table': 'fake_grab_order_shuffle',
+            },
+        ),
+    ]