added missing migrations and finished admin feature implementation

backend/api/migrations/0028_job_systemconfig.py

@@ -0,0 +1,40 @@
+# Generated by Django 6.0.2 on 2026-02-19 16:26
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('api', '0027_alter_notification_notification_type'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Job',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(choices=[('sync_flavors', 'Sync Shopify Flavors'), ('cleanup_duplicates', 'Cleanup Duplicate Flavors'), ('backup_db', 'Database Backup'), ('seed_legacy', 'Seed Legacy Data')], max_length=100)),
+                ('status', models.CharField(choices=[('pending', 'Pending'), ('running', 'Running'), ('completed', 'Completed'), ('failed', 'Failed')], default='pending', max_length=20)),
+                ('last_run', models.DateTimeField(blank=True, null=True)),
+                ('next_run', models.DateTimeField(blank=True, null=True)),
+                ('interval_hours', models.IntegerField(default=0, help_text='Set to 0 to disable periodic run.')),
+                ('last_output', models.TextField(blank=True)),
+                ('error_message', models.TextField(blank=True)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='SystemConfig',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('site_name', models.CharField(default='Holy Flavors Archive', max_length=100)),
+                ('maintenance_mode', models.BooleanField(default=False)),
+                ('allow_new_signups', models.BooleanField(default=True)),
+                ('require_email_verification', models.BooleanField(default=True)),
+                ('updated_at', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'verbose_name': 'System Configuration',
+            },
+        ),
+    ]