feat(currencies): add Frankfurter as an Exchange Rate provider

app/apps/currencies/migrations/0017_alter_exchangerateservice_service_type.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.5 on 2025-08-16 22:18
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('currencies', '0016_alter_exchangerate_automatic'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='exchangerateservice',
+            name='service_type',
+            field=models.CharField(choices=[('synth_finance', 'Synth Finance'), ('synth_finance_stock', 'Synth Finance Stock'), ('coingecko_free', 'CoinGecko (Demo/Free)'), ('coingecko_pro', 'CoinGecko (Pro)'), ('transitive', 'Transitive (Calculated from Existing Rates)'), ('frankfurter', 'Frankfurter')], max_length=255, verbose_name='Service Type'),
+        ),
+    ]