feat: change segment_size to decimal in Product model

basic_info/migrations/0023_alter_product_segment_size.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.8 on 2025-12-27 06:16
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('basic_info', '0022_product_pieces_product_segment_size'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='product',
+            name='segment_size',
+            field=models.DecimalField(blank=True, decimal_places=2, max_digits=8, null=True, verbose_name='一段尺寸'),
+        ),
+    ]