fix: defer daily report push и увеличить pool БД (0.4.12)

FCM/каналы для report.daily.* после commit ingest (BackgroundTasks);
SAC_DB_POOL_SIZE=15, SAC_DB_MAX_OVERFLOW=25 для штурма 09:00.

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

backend/tests/test_ingest.py

@@ -126,7 +126,7 @@ def test_ingest_daily_report_calls_notify_daily_report(client, auth_headers):
         "summary": "stats",
         "details": {"generated_by": "agent", "report_body": "line1"},
     }
-    with patch.object(events_api, "notify_daily_report") as mock_daily:
+    with patch.object(events_api, "schedule_notify_daily_report") as mock_daily:
         with patch.object(events_api, "notify_event") as mock_event:
             r = client.post("/api/v1/events", json=payload, headers=auth_headers)
     assert r.status_code == 201