Postgres support (DB_* env), LoginEvent audit table, Choice.value 300, deploy.sh pg_dump backup

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

content/migrations/0012_choice_value_300.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.17 on 2026-10-08 08:02
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('content', '0011_lesson_figures'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='choice',
+            name='value',
+            field=models.CharField(max_length=300),
+        ),
+    ]