fix: FCM data-only push so Seaca controls sound (0.9.6)

Send title and body in the data payload instead of notification block so
onMessageReceived always runs and the app can honour silent mode in background.

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

frontend/src/version.ts

@@ -1,4 +1,4 @@
 /** Fallback до загрузки /health; при релизе держите в sync с backend/app/version.py */
 export const APP_NAME = "Security Alert Center";
-export const APP_VERSION = "0.9.4";
+export const APP_VERSION = "0.9.6";
 export const APP_VERSION_LABEL = `${APP_NAME} v.${APP_VERSION}`;