feat(media): add client and project thumbnails

apps/clients/migrations/0002_client_thumbnail.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.12 on 2026-05-26 08:20
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('clients', '0001_initial'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='client',
+            name='thumbnail',
+            field=models.ImageField(blank=True, null=True, upload_to='profile/clients/'),
+        ),
+    ]