Add a dev-only Notification Debug Panel at /dev/notifications for testing
predictive refresh and WAKEUP_PING without a backend.
- Gate route and Advanced Settings entry on import.meta.env.DEV
- NotificationDebugService drives mock refresh, flood test, clear, and
wake simulation via existing handleCapacitorPushNotificationReceived and
applyNotificationRefreshPayload (shared with refreshNotifications)
- Add NotificationInspector Capacitor plugin: iOS lists pending
UNNotificationRequest identifiers and next trigger; Android stub returns
empty pending for safe registration
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