feat(core): entry 历史附带关联 secret 密文快照，rollback 可恢复 N:N 与密文

- db: metadata_with_secret_snapshot / strip / parse 辅助
- add/update/delete/rollback 在写 entries_history 前合并快照
- rollback: 按历史快照同步 entry_secrets、更新或插入 secrets
- 满足 clippy collapsible_if

crates/secrets-core/src/service/delete.rs

@@ -441,6 +441,15 @@ async fn snapshot_and_delete(
     row: &EntryRow,
     user_id: Option<Uuid>,
 ) -> Result<()> {
+    let history_metadata = match db::metadata_with_secret_snapshot(tx, row.id, &row.metadata).await
+    {
+        Ok(v) => v,
+        Err(e) => {
+            tracing::warn!(error = %e, "failed to build secret snapshot for entry history");
+            row.metadata.clone()
+        }
+    };
+
     if let Err(e) = db::snapshot_entry_history(
         tx,
         db::EntrySnapshotParams {
@@ -452,7 +461,7 @@ async fn snapshot_and_delete(
             version: row.version,
             action: "delete",
             tags: &row.tags,
-            metadata: &row.metadata,
+            metadata: &history_metadata,
         },
     )
     .await