feat: show model pricing in configuration UI (#528)

* feat: show model pricing in configuration UI

* fix: display effective pricing rounding policy

api/tests/test_model_configuration_pricing.py

@@ -0,0 +1,66 @@
+from types import SimpleNamespace
+from unittest.mock import AsyncMock
+
+import pytest
+
+from api.routes import organization as organization_routes
+
+
+@pytest.mark.asyncio
+async def test_model_configuration_pricing_returns_empty_in_oss(monkeypatch):
+    get_pricing = AsyncMock()
+    monkeypatch.setattr(organization_routes, "DEPLOYMENT_MODE", "oss")
+    monkeypatch.setattr(
+        organization_routes.mps_service_key_client,
+        "get_billing_pricing",
+        get_pricing,
+    )
+
+    response = await organization_routes.get_model_configuration_pricing(
+        SimpleNamespace(selected_organization_id=42),
+    )
+
+    assert response.platform_usage is None
+    assert response.dograh_model is None
+    get_pricing.assert_not_awaited()
+
+
+@pytest.mark.asyncio
+async def test_model_configuration_pricing_uses_selected_organization(monkeypatch):
+    get_pricing = AsyncMock(
+        return_value={
+            "organization_id": 42,
+            "platform_usage": {
+                "metric_code": "platform_usage",
+                "display_name": "Platform usage",
+                "unit": "minute",
+                "price_per_minute": 0.01,
+                "currency": "USD",
+                "rounding_policy": "ceil_minute",
+            },
+            "dograh_model": {
+                "metric_code": "voice_minutes",
+                "display_name": "Dograh model usage",
+                "unit": "minute",
+                "price_per_minute": 0.07,
+                "currency": "USD",
+                "rounding_policy": "ceil_minute",
+            },
+        }
+    )
+    monkeypatch.setattr(organization_routes, "DEPLOYMENT_MODE", "saas")
+    monkeypatch.setattr(
+        organization_routes.mps_service_key_client,
+        "get_billing_pricing",
+        get_pricing,
+    )
+
+    response = await organization_routes.get_model_configuration_pricing(
+        SimpleNamespace(selected_organization_id=42),
+    )
+
+    get_pricing.assert_awaited_once_with(42)
+    assert response.platform_usage is not None
+    assert response.platform_usage.price_per_minute == 0.01
+    assert response.dograh_model is not None
+    assert response.dograh_model.price_per_minute == 0.07