refactor: modularize workspace sync logic and optimize state snapshotting with reduced sync interval

feat: add UptimeRobot monitor setup UI and backend integration to prevent Space sleep

feat: add WhatsApp pairing guardian, improve DNS resolution, and implement workspace sync status reporting

Remove legacy workspace-sync.sh, keep only Python sync

v1.1.0: Pre-built Docker image, huggingface_hub sync, password auth, trusted proxies

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