refactor: reorganizar estructura del proyecto al estándar app/api_config

- core/ → app/api_config/
- apps/backend_admin/ → app/backend_admin/
- apps/common/ → app/common/
- apps/promociones/ → app/promociones/
- manage.py → app/manage.py
- Añadir app/requirements.txt
- Actualizar todos los imports y referencias (DJANGO_SETTINGS_MODULE, ROOT_URLCONF, WSGI_APPLICATION, INSTALLED_APPS)
- Actualizar Dockerfile con nuevo WORKDIR

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/backend_admin/migrations/0001_initial.py

@@ -0,0 +1,35 @@
+# Generated by Django 5.0.3 on 2026-04-14 23:15
+
+import django.utils.timezone
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Log',
+            fields=[
+                ('id', models.BigAutoField(primary_key=True, serialize=False)),
+                ('user_id', models.IntegerField(default=0)),
+                ('user', models.CharField(default='anonimo', max_length=255)),
+                ('app_id', models.IntegerField(default=0)),
+                ('remote_address', models.GenericIPAddressField(blank=True, null=True)),
+                ('request', models.JSONField(blank=True, null=True)),
+                ('response', models.JSONField(blank=True, null=True)),
+                ('status_code', models.CharField(default='0', max_length=10)),
+                ('path', models.CharField(max_length=255)),
+                ('method', models.CharField(max_length=10)),
+                ('createdAt', models.DateTimeField(default=django.utils.timezone.now)),
+                ('updatedAt', models.DateTimeField(auto_now=True)),
+            ],
+            options={
+                'db_table': 'audit_logs',
+            },
+        ),
+    ]

app/backend_admin/migrations/__init__.py

@@ -0,0 +1 @@
+# Archivo para marcar esta carpeta como paquete de migraciones