Auto sync tasks

[mdmohsin7]

• Automatically send the newly created tasks to connected integration
• For apple reminders send bg fcm msg to phone and let the app handle it in bg using remote-notification
• Fix apple reminders permission issue

[gemini-code-assist]

Code Review

This pull request introduces automatic task synchronization with connected integrations. For Apple Reminders, it uses silent push notifications to trigger background creation on the device, including a fix for iOS 17 permission handling. For other integrations, the backend is updated to trigger sync upon task creation. My review focuses on a critical regression in the backend's OAuth token handling and a performance improvement in the iOS implementation. The changes are otherwise well-structured and address the goals of the pull request.