Add settings page and configurable network map types.

Let users define sector/circle labels and geometry per map type, choose a type when creating maps, and sync types through local backup and API migrations.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/contacts/migrations/0008_alter_relation_interaction_intensity.py

@@ -0,0 +1,18 @@
+# Generated by Django 4.2.9 on 2026-06-25 02:21
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contacts', '0007_network_map_types'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='relation',
+            name='interaction_intensity',
+            field=models.CharField(choices=[('intense', 'Интенсивные контакты'), ('periodic', 'Периодические контакты'), ('sparse', 'Редкие контакты')], default='intense', max_length=32, verbose_name='Интенсивность общения'),
+        ),
+    ]