refactor(lock): unify NamespaceLock client model and LockRequest API

- Refactor NamespaceLock to use a unified client vector and quorum mechanism,
  removing legacy local/distributed lock split and related code.
- Update LockRequest to split timeout into acquire_timeout and ttl, and add
  builder methods for both.
- Adjust all batch lock APIs to accept ttl and use new LockRequest fields.
- Update all affected tests and documentation for the new API.

Signed-off-by: junxiang Mu <1948535941@qq.com>

crates/ecstore/src/lib.rs

@@ -30,6 +30,7 @@ pub mod erasure_coding;
 pub mod error;
 pub mod global;
 pub mod heal;
+pub mod lock_utils;
 pub mod metrics_realtime;
 pub mod notification_sys;
 pub mod pools;