Add encrypted-at-rest sync service with remote manifest and reconciliation - #64
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Adds `syncEnabled` and `syncProfileId` to `VaultSettings` with support in the constructor, `copyWith`, `toJson`, and `fromJson`.
Adds `modifiedAt` (LWW timestamp), `remoteHash` (sha256 of ciphertext), and `syncedDeleted` to support encrypted-at-rest sync without clobbering existing mutation semantics.
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Summary
Adds a sync service with encrypted-at-rest blob transport, remote manifest model, reconciliation logic, and bookkeeping fields on vault entries for conflict-free synchronization.
Changes
Sync Infrastructure
SyncProfilemodel withSyncDirectionenum and JSON serializationVaultedFile(modifiedAtLWW timestamp,remoteHashsha256,syncedDeleted)VaultSettings(syncEnabled,syncProfileId)RemoteStoreabstract interface for blob transportSync Service
SyncServicewith reconciliation and manifest encryptionTesting
SyncServicereconcile, crypto, and model serializationDocumentation