Adds the per-account PBKDF2 salt endpoint and an in-memory CryptoSession
that derives keys lazily per saltId. Lets future kinds (OPDS catalogs in
PR 4b) encrypt/decrypt fields without re-deriving on every operation.
- Migration 008: replica_keys_{create,list} RPCs round-trip the bytea
salt as base64; SECURITY INVOKER, RLS-gated by the existing replica_keys
policies.
- /api/sync/replica-keys GET/POST endpoint matches the dual app/pages
shape used by /api/sync/replicas.
- ReplicaSyncClient.{listReplicaKeys,createReplicaKey} wraps the endpoint.
- CryptoSession.{unlock,setup,encryptField,decryptField,lock} caches
derived keys per saltId; foreign envelopes trigger a lazy re-list +
derive. Iterations injectable so tests run with PBKDF2 ITER=1000.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Huang Xin
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