feat(server): 用户管理与变更历史接口；修复 result_revisions.parent_id 从未写入

server/internal/httpapi/scoring.go

@@ -584,10 +584,16 @@ func recordRevision(ctx context.Context, tx *sql.Tx, eventID int64, action strin
 	if err != nil {
 		return internal(err)
 	}
+	// 父节点 = 该小项最近一次版本，串成一条主线；撤销后再发布会自然从撤销点分出新分支。
+	var parentID sql.NullInt64
+	if err := tx.QueryRowContext(ctx,
+		`SELECT MAX(id) FROM result_revisions WHERE event_id = ?`, eventID).Scan(&parentID); err != nil {
+		return internal(err)
+	}
 	_, err = tx.ExecContext(ctx,
-		`INSERT INTO result_revisions (event_id, action, snapshot_json, ledger_ids, actor_id, message)
-		 VALUES (?, ?, ?, '[]', ?, ?)`,
-		eventID, action, string(snapshot), nullID(actorID), message)
+		`INSERT INTO result_revisions (parent_id, event_id, action, snapshot_json, ledger_ids, actor_id, message)
+		 VALUES (?, ?, ?, ?, '[]', ?, ?)`,
+		parentID, eventID, action, string(snapshot), nullID(actorID), message)
 	if err != nil {
 		return internal(err)
 	}