refactor(ecstore): migrate mutable globals into ECStore struct fields (#3214)

* refactor(ecstore): migrate mutable globals into ECStore struct fields

Phase 1 of global singleton consolidation. Move mutable globals from
lazy_static into ECStore struct fields as the first step toward
dependency injection and multi-instance support.

New ECStore fields:
- is_erasure, is_dist_erasure, is_erasure_sd (erasure type flags)
- local_disk_map, local_disk_id_map, local_disk_set_drives
- root_disk_threshold
- tier_config_mgr, event_notifier, bucket_monitor

New accessor methods:
- is_erasure(), is_dist_erasure(), is_erasure_sd()
- update_erasure_type()
- tier_config_mgr(), event_notifier(), bucket_monitor()

Global functions in global.rs preserved for backward compatibility.
1151 ecstore tests pass.

* fix: address PR #3214 review comments

- Sync ECStore fields from globals after init()
- Enforce DistErasure => is_erasure invariant in update_erasure_type()
- Change bucket_monitor from Option to OnceLock for deferred initialization
- Restrict TypeLocalDiskSetDrives to pub(crate)
- 1151 tests pass

* fix: address PR #3150 review comments

- Restore get_host_addr as best-effort wrapper (String return type)
- Replace bare expect("err") with descriptive messages in unsigned trailer
- Simplify aws-chunked header construction
- 20 signer + 96 io-core tests pass

* fix(ecstore): format store imports

* fix(ecstore): keep migrated accessors in sync

* fix(signer): preserve host fallback and unsigned trailer errors

* fix(ecstore): defer migrated global accessors

* fix(signer): box unsigned trailer signing errors

* fix(ecstore): avoid lock awaits during sync

* fix(ecstore): narrow phase one globals

---------

Co-authored-by: houseme <housemecn@gmail.com>

crates/ecstore/src/store/bucket.rs

@@ -14,6 +14,7 @@
 
 use super::*;
 use crate::bucket::{metadata::BUCKET_TABLE_RESERVED_PREFIX, utils::is_meta_bucketname};
+use crate::global::get_global_bucket_monitor;
 use crate::set_disk::get_lock_acquire_timeout;
 
 fn should_override_created_from_metadata(created: OffsetDateTime) -> bool {

crates/ecstore/src/store/init.rs

@@ -14,7 +14,10 @@
 
 use super::*;
 use crate::error::is_err_decommission_running;
-use crate::global::is_first_cluster_node_local;
+use crate::global::{
+    GLOBAL_EventNotifier, GLOBAL_LOCAL_DISK_ID_MAP, GLOBAL_LOCAL_DISK_MAP, GLOBAL_LOCAL_DISK_SET_DRIVES, GLOBAL_TierConfigMgr,
+    get_global_bucket_monitor, is_dist_erasure, is_first_cluster_node_local,
+};
 
 fn pool_first_endpoint_is_local(pool: &crate::endpoints::PoolEndpoints) -> bool {
     pool.endpoints.as_ref().first().is_some_and(|endpoint| endpoint.is_local)
@@ -244,6 +247,13 @@ impl ECStore {
             pool_meta: RwLock::new(pool_meta),
             rebalance_meta: RwLock::new(None),
             decommission_cancelers,
+
+            local_disk_map: GLOBAL_LOCAL_DISK_MAP.clone(),
+            local_disk_id_map: GLOBAL_LOCAL_DISK_ID_MAP.clone(),
+            local_disk_set_drives: GLOBAL_LOCAL_DISK_SET_DRIVES.clone(),
+            tier_config_mgr: GLOBAL_TierConfigMgr.clone(),
+            event_notifier: GLOBAL_EventNotifier.clone(),
+            bucket_monitor: OnceLock::new(),
         });
 
         // Only set it when the global deployment ID is not yet configured
@@ -275,6 +285,10 @@ impl ECStore {
 
         set_object_layer(ec.clone()).await;
 
+        if let Some(monitor) = get_global_bucket_monitor() {
+            let _ = ec.bucket_monitor.set(monitor);
+        }
+
         Ok(ec)
     }