feat: Seaca mobile API, enrollment, FCM push and admin UI (0.9.0)

Adds mobile device registration by admin codes, refresh tokens, push channel
in notification policy, and Settings section for managing Seaca clients.

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

frontend/src/version.ts

@@ -1,3 +1,3 @@
 export const APP_NAME = "Security Alert Center";
-export const APP_VERSION = "0.8.3";
+export const APP_VERSION = "0.9.0";
 export const APP_VERSION_LABEL = `${APP_NAME} v.${APP_VERSION}`;