feat(scheduling): expose invitation delivery capability

tests/test_participant_privacy.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import unittest
 from datetime import datetime, timezone
+from unittest.mock import patch
 
 from sqlalchemy import create_engine
 from sqlalchemy.orm import Session, sessionmaker
@@ -184,7 +185,11 @@ class SchedulingParticipantPrivacyTests(unittest.TestCase):
     def test_secure_default_returns_own_row_and_aggregate_counts(self) -> None:
         request = self._request()
 
-        payload = self._participant_projection(request)
+        with patch(
+            "govoplan_scheduling.backend.service.notification_dispatch_provider",
+            return_value=object(),
+        ):
+            payload = self._participant_projection(request)
         response = SchedulingRequestResponse.model_validate(payload)
 
         self.assertEqual(request.participant_visibility, "aggregates_only")
@@ -212,6 +217,7 @@ class SchedulingParticipantPrivacyTests(unittest.TestCase):
         self.assertIsNone(response.create_calendar_event_on_decision)
         self.assertIsNone(response.calendar_event_id)
         self.assertIsNone(response.public_participation_policy_enforcement_available)
+        self.assertIsNone(response.participant_invitation_delivery_available)
         self.assertEqual(response.metadata, {})
         slot = response.slots[0]
         self.assertIsNone(slot.poll_option_id)
@@ -287,6 +293,22 @@ class SchedulingParticipantPrivacyTests(unittest.TestCase):
                 "connector-uid-internal",
             )
             self.assertEqual(response.slots[0].tentative_hold_event_id, "hold-internal")
+            self.assertFalse(response.participant_invitation_delivery_available)
+
+        with patch(
+            "govoplan_scheduling.backend.service.notification_dispatch_provider",
+            return_value=object(),
+        ):
+            delivery_enabled = SchedulingRequestResponse.model_validate(
+                scheduling_request_response(
+                    request,
+                    actor_ids=("manager-1",),
+                    actor_user_id="manager-1",
+                    can_manage=True,
+                )
+            )
+
+        self.assertTrue(delivery_enabled.participant_invitation_delivery_available)
 
     def test_optional_policy_can_reduce_but_cannot_broaden_visibility(self) -> None:
         restricting_policy = _PrivacyPolicy("aggregates_only")