feat(scanner): coordinate usage and workload boundaries (#7093)

* test(scanner): wire usage and heal rebuild gates

* docs(scanner): define usage authority protocol

* docs(heal): clarify scanner and ecstore boundaries

* refactor(scanner): split metrics from contracts

* feat(scanner): use shared workload snapshots

* fix(ecstore): recheck capacity before decommission drain

crates/ecstore/src/object_api/types.rs

@@ -286,7 +286,7 @@ pub struct QuotaAdmission {
 pub struct LifecycleDeleteAllRequest {
     pub(crate) version_id: Option<Uuid>,
     pub(crate) delete_marker: bool,
-    pub(crate) action: rustfs_scanner_contracts::metrics::IlmAction,
+    pub(crate) action: rustfs_scanner_metrics::metrics::IlmAction,
     pub(crate) rule_id: String,
     pub(crate) phase: LifecycleDeleteAllPhase,
 }