fix(redis): cast vector_distance to float to prevent TypeError on threshold search

[NIK-TIGER-BILL]

Problem

redisvl returns vector_distance as a string, not a float. When memory.search() is called with a threshold parameter, mem0 compares the score to the threshold:

score=result["vector_distance"]  # str, e.g. '0.123456'

This causes (closes #4294):

TypeError: '>=' not supported between instances of 'str' and 'float'

Fix

Wrap the vector_distance value in float() before assigning it to score:

score=float(result["vector_distance"])  # ✅

One-line change, no behaviour change for valid distances.

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