fix(site-replication): persist source stamps and apply IAM items atomically (backlog#2291)

Review findings on rustfs#7195: the receive-side staleness gate compared a
source `updatedAt` against a stamp the local write had put on the record,
and the verdict, the write and the deletion mark were three separate steps.

- IAM writes gain explicit-stamp variants (`set_policy_at`, `policy_db_set_at`,
  group and user `*_at`, `new_service_account_at`, `update_service_account_at`)
  so a replicated record carries its source time; local edits are unchanged.
- `apply_iam_item` runs verdict, write and mark commit under the
  site-replication state transaction (distributed state-object lock), so a
  concurrent older grant and newer revoke are ordered on every node.
- A replicated service account is created with its source status in one
  write (`NewServiceAccountOpts::status`), never enabled transiently.
- Deletion marks are pruned by age (30 days) instead of by count.
- Bucket-config deletes persist the source stamp (`delete_if_incarnation_at`).

Regressions run through the real receiver: delayed in-order updates for every
gated item type, concurrent grant/revoke, delete then stale re-create, disabled
service-account create, delete stamping in ecstore, and mark retention.

crates/ecstore/src/api/mod.rs

@@ -199,16 +199,16 @@ pub mod bucket {
         pub use crate::bucket::metadata_sys::{
             BucketMetadataMutationGuard, BucketMetadataSys, ObjectLockConfigState, acquire_bucket_metadata_transaction_lock,
             acquire_bucket_metadata_transaction_lock_for_incarnation, acquire_scanner_bucket_incarnation_fence,
-            capture_bucket_metadata_incarnation, delete, delete_if_incarnation, delete_under_transaction_lock, get,
-            get_accelerate_config, get_bucket_policy, get_bucket_policy_raw, get_bucket_targets_config, get_config_from_disk,
-            get_cors_config, get_durability_config, get_global_bucket_metadata_sys, get_lifecycle_config, get_logging_config,
-            get_notification_config, get_object_lock_config, get_object_lock_config_state, get_on_demand_migration_config,
-            get_public_access_block_config, get_quota_config, get_replication_config, get_request_payment_config, get_sse_config,
-            get_tagging_config, get_versioning_config, get_website_config, init_bucket_metadata_sys, list_bucket_targets,
-            reload_bucket_metadata, remove_bucket_metadata, set_bucket_metadata, update,
-            update_bucket_targets_under_transaction_lock, update_config_with, update_if_incarnation, update_if_incarnation_at,
-            update_quota_if_incarnation, update_quota_if_incarnation_at, update_under_transaction_lock,
-            update_under_transaction_lock_at,
+            capture_bucket_metadata_incarnation, delete, delete_if_incarnation, delete_if_incarnation_at,
+            delete_under_transaction_lock, get, get_accelerate_config, get_bucket_policy, get_bucket_policy_raw,
+            get_bucket_targets_config, get_config_from_disk, get_cors_config, get_durability_config,
+            get_global_bucket_metadata_sys, get_lifecycle_config, get_logging_config, get_notification_config,
+            get_object_lock_config, get_object_lock_config_state, get_on_demand_migration_config, get_public_access_block_config,
+            get_quota_config, get_replication_config, get_request_payment_config, get_sse_config, get_tagging_config,
+            get_versioning_config, get_website_config, init_bucket_metadata_sys, list_bucket_targets, reload_bucket_metadata,
+            remove_bucket_metadata, set_bucket_metadata, update, update_bucket_targets_under_transaction_lock,
+            update_config_with, update_if_incarnation, update_if_incarnation_at, update_quota_if_incarnation,
+            update_quota_if_incarnation_at, update_under_transaction_lock, update_under_transaction_lock_at,
         };
     }