fix(replication): keep operator rule priorities across site rule merges

Merging stored site-replication rules into a PutBucketReplication body
renumbered every rule 1..n in list order, rewriting the submitted policy:
overlapping same-target rules submitted as priority 5 then 1 became 1
then 2, so the delete-marker-disabled rule won the replication decision.
The reconciler and the peer-removal prune renumbered the same way.

Operator priorities now stay verbatim everywhere; only the reconciler's
derived rules move, to the lowest priorities no operator rule uses, via
one pure helper shared by the S3 edit merge, the peer ingestion merge,
the reconciler pass and the prune. Being a pure function of the rule
list it is idempotent, so the reconciler's no-op check still holds after
a merged write, and an on-disk config in the historical layout (operator
rules 1..k, site rules k+1..n) yields the same bytes, so nothing is
rewritten on upgrade.

crates/ecstore/src/api/mod.rs

@@ -196,9 +196,9 @@ pub mod bucket {
             ReplicationOperation, ReplicationPoolTrait, ReplicationPriority, ReplicationQueueAdmission, ReplicationScannerBridge,
             ReplicationState, ReplicationStats, ReplicationStatusType, ReplicationStorage, ReplicationTargetValidationError,
             ReplicationType, ResyncOpts, ResyncStatusType, RuntimeReplicationTargetBacklog, TargetReplicationResyncStatus,
-            VersionPurgeStatusType, XferStats, commit_force_delete_intent, complete_force_delete_intent,
-            delete_replication_state_from_config, delete_replication_version_id, get_global_replication_pool,
-            get_global_replication_stats, get_proxy_targets, init_background_replication,
+            VersionPurgeStatusType, XferStats, assign_site_replication_rule_priorities, commit_force_delete_intent,
+            complete_force_delete_intent, delete_replication_state_from_config, delete_replication_version_id,
+            get_global_replication_pool, get_global_replication_stats, get_proxy_targets, init_background_replication,
             invalid_replication_config_status_field, is_site_replication_rule, merge_incoming_replication_config,
             merge_user_replication_config, persist_force_delete_intent, read_durable_mrf_backlog, replication_state_to_filemeta,
             replication_status_to_filemeta, replication_statuses_map, replication_target_arn_deployment_id,

crates/ecstore/src/bucket/replication/mod.rs

@@ -47,10 +47,10 @@ pub use replication_config_boundary::{
     ObjectOpts, REMOTE_TARGET_CAPABILITY_CONTRACT_VERSION, REMOTE_TARGET_UNSUPPORTED_FIELDS, REMOTE_TARGET_WRITABLE_FIELDS,
     REPLICATION_CAPABILITY_CONTRACT_VERSION, REPLICATION_READ_ONLY_HISTORICAL_FIELDS, REPLICATION_WRITABLE_FIELDS,
     ReplicationConfigStructureError, ReplicationConfigurationExt, ReplicationTargetValidationError,
-    invalid_replication_config_status_field, is_site_replication_rule, merge_incoming_replication_config,
-    merge_user_replication_config, replication_target_arn_deployment_id, replication_target_arns,
-    should_remove_replication_target, unsupported_replication_config_field, validate_replication_config_structure,
-    validate_replication_config_target_arns,
+    assign_site_replication_rule_priorities, invalid_replication_config_status_field, is_site_replication_rule,
+    merge_incoming_replication_config, merge_user_replication_config, replication_target_arn_deployment_id,
+    replication_target_arns, should_remove_replication_target, unsupported_replication_config_field,
+    validate_replication_config_structure, validate_replication_config_target_arns,
 };
 pub(crate) use replication_filemeta_boundary::version_purge_statuses_map;
 pub use replication_filemeta_boundary::{

crates/ecstore/src/bucket/replication/replication_config_boundary.rs

@@ -16,8 +16,8 @@ pub use rustfs_replication::{
     ObjectOpts, REMOTE_TARGET_CAPABILITY_CONTRACT_VERSION, REMOTE_TARGET_UNSUPPORTED_FIELDS, REMOTE_TARGET_WRITABLE_FIELDS,
     REPLICATION_CAPABILITY_CONTRACT_VERSION, REPLICATION_READ_ONLY_HISTORICAL_FIELDS, REPLICATION_WRITABLE_FIELDS,
     ReplicationConfigStructureError, ReplicationConfigurationExt, ReplicationRuleExt, ReplicationTargetValidationError,
-    invalid_replication_config_status_field, is_site_replication_rule, merge_incoming_replication_config,
-    merge_user_replication_config, replication_target_arn_deployment_id, replication_target_arns,
-    should_remove_replication_target, unsupported_replication_config_field, validate_replication_config_structure,
-    validate_replication_config_target_arns,
+    assign_site_replication_rule_priorities, invalid_replication_config_status_field, is_site_replication_rule,
+    merge_incoming_replication_config, merge_user_replication_config, replication_target_arn_deployment_id,
+    replication_target_arns, should_remove_replication_target, unsupported_replication_config_field,
+    validate_replication_config_structure, validate_replication_config_target_arns,
 };