Note

Medium Risk
Changes legacy RDB deserialization to return structured Errors instead of panicking/unwrap()ing, which affects database loading behavior on invalid/corrupt data or unexpected encoding versions.

Overview
Improves legacy RedisJSON RDB loading by propagating failures as Result errors rather than crashing the module.

backward::json_rdb_load now uses TryFrom<u64> for NodeType so unknown node type tags return an Error instead of panic!, and nested dict entries also use fallible conversion.

value_rdb_load_json now propagates JSON serialization/UTF-8 failures with ? and returns an explicit error for unsupported encver values instead of panic!.

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