Implements issue #112: MLS group state must survive process restarts. The MLS
provider hardcoded an in-memory store separate from the chat store, so a restart
lost every group. Fold the OpenMLS StorageProvider into libchat's own ChatStore
so one durable store holds both chat state and MLS group state.
- storage: ChatStore subsumes StorageProvider<CURRENT_VERSION>, so a ChatStore is
the whole durable-storage contract (identity/ephemeral/conversation/ratchet
sub-stores plus the MLS key-value surface).
- chat-sqlite: ChatStorage implements StorageProvider over an mls_kv table
(migration 003_mls_storage), a byte-faithful port of MemoryStorage with decode
errors surfaced instead of unwrapped and the reference clear_proposal_queue
orphan-key bug fixed. The separate SqliteMlsStorage type is removed.
- conversations: MlsPqProvider becomes a transient view borrowing the shared
store and a long-lived crypto backend, so the store stays singly owned;
ServiceContext hands it out via mls_provider(). ExternalServices drops its ST
associated type, leaving one CS. GroupV2/de_mls's thread-safe-error bound is
restated on CS because an associated-type bound does not elaborate through a
supertrait.
- client: the store is always ChatStorage, so fix it as such and drop the
vestigial store generic from ChatClient and the builder. Retire the stubbed
in-memory MemStore in favour of ChatStorage::in_memory().
- GroupV1 conversations resume across a restart through the existing
MlsGroup::load path, proven by a drop-and-reload integration test.
* feat: account to device store
* feat: accout traits and codec
* feat: integrate accounts abstraction
* chore: clean docs and naming
* remove account public key from payload
* chore: fix clippy
* feat: lamport check before update account store
* chore: rebase to core
* chore: register account in new core
* chore: rebase changes and use account pub for index account store
* chore: move chat store outside of libchat
* chore: use account pub for registry
* feat: http server based key package registry
* chore: instructions on running the registration service
* chore: remove duplicate post param
* chore: revert out sourced account id for multi devices support
* feat: signature on account id and key packages
* chore: include http registry in contact registry module
* refactor: use device id for retrieve key package
* chore: use string for device id
* feat: server verification on the register
* chore: doc the smoke test
* chore: fix data folder non exist
* chore: use payload for register and retrieve
* chore: fix clippy
