Refactor device management: add vendor field, enhance admin display, and improve MAC address handling

devices/migrations/0007_device_vendor.py

@@ -0,0 +1,17 @@
+# Generated by Django 5.2 on 2025-06-01 13:17
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("devices", "0006_alter_device_mac"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="device",
+            name="vendor",
+            field=models.CharField(blank=True, default="", max_length=255, null=True),
+        ),
+    ]