Support loading Redis RDB files via Foundation::LoadRdb

Support loading Redis RDB files via Foundation::LoadRdb: a task in LegoFlow-SWE (Harbor dataset). Currently, the system can parse serialized binary formats from Redis (see issue 1684) but does not support loading data directly from full RDB files. Users need the ability to bulk-load data from a…

The task

Currently, the system can parse serialized binary formats from Redis (see issue #1684) but does not support loading data directly from full RDB files. Users need the ability to bulk-load data from a `.rdb` file into storage.

Part of Lego-X/LegoFlow-SWE.