RFC: Database Architecture Overhaul Proposal

[google-labs-jules]

This PR adds docs/RFC_PERFORMANCE_OVERHAUL.md in response to the user's request for a solution to performance bottlenecks caused by the current Singleton/Document-based storage architecture.

The RFC details:

1. Analysis: Identifies O(N) scaling issues with Snapshot, Encoding, and Network traffic.
2. Answer: Confirms that full snapshotting is not inevitable.
3. Proposal: Recommends transitioning to SQLite (backend/local) and implementing Delta Sync to achieve O(1) write performance and drastic network reduction.
4. Mitigation: Suggests a chunked file strategy as an intermediate step.

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PR created automatically by Jules for task 7717407163191255289 started by @kangjoseph90

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