fix: Seaca push uses same lifecycle text as Telegram (0.9.11)

Reuse telegram templates for FCM title/body so agent start/restart
reasons reach mobile without Seaca app changes.

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

backend/app/services/mobile_notify.py

@@ -16,6 +16,7 @@ from app.models import Event, Problem
 from app.models.mobile_device import MobileDevice
 from app.services.notification_severity import severity_meets_minimum
 from app.services.notification_policy import get_effective_notification_policy
+from app.services.telegram_templates import format_event_mobile_push
 
 logger = logging.getLogger(__name__)
 
@@ -170,8 +171,7 @@ def _send_fcm_data(
 
 
 def _event_payload(event: Event) -> tuple[str, str, dict[str, str]]:
-    title = f"[{event.severity}] {event.title}"
-    body = (event.summary or "")[:200]
+    title, body = format_event_mobile_push(event)
     data = {
         "kind": "event",
         "id": str(event.id),