Add comprehensive Storage synchronization analysis report

[cto-new]

Summary

This PR adds a comprehensive analysis report detailing the Storage synchronization mechanism across index.js and WebView storages, IPC channels, and shared data sources. It serves as a reference to diagnose data drift and guide potential improvements.

Details

• Document Storage implementations (index.js and WebView), including storage methods, data sources, initialization timing, and external interfaces.
• Analyze cross-component communication: IPC channels, event subscription/publishing, and whether databases are shared or isolated.
• Identify root causes of data desync: notifications gaps, initialization order, isolation issues, and other potential factors.
• Propose improvement directions: notification guarantees, tighter init sequencing, syncing strategy options, and observability.
• Note: This change adds STORAGE_SYNC_ANALYSIS.md at repository root without modifying runtime code.

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