fix(tests): correct Decimal round-trip assertion in redis cache test

[deangoodmanson]

Summary

• Fixes a pre-existing test failure in test_redis_cache_set_get (in core/src/cache/redis.rs)
• rust_decimal::Decimal values may deserialize with a different internal scale encoding after a JSON round-trip, causing assert_eq! to fail even when values are numerically equal
• Fix: compare via .to_string() rather than direct assert_eq! on the Decimal values

Changes

• core/src/cache/redis.rs: ~4 lines changed in one assertion

Test plan

• cargo test -p kruxiaflow-core --lib — all unit tests pass
• Specifically test_redis_cache_set_get passes (requires Redis running locally)

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