fixes mem0 with valkey/redis issue

[MatthiasHowellYopp]

changes to support using mem0 with valkey/redis as external memory provider for crewai

fixes #4031

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Note

Flattens Mem0Storage search filters for Valkey/Redis providers and adds comprehensive tests for provider behavior and None-config safety.

• Memory/Search (Mem0Storage):
  • Flatten filters when vector_store.provider is valkey or redis and there's a single condition (return lone AND/OR entry directly).
  • Preserve structured AND/OR filters in other cases/providers.
• Tests:
  • Add cases for Valkey and Redis verifying flattened single-condition filters.
  • Verify multiple-condition OR filters remain structured for Valkey.
  • Ensure non-Valkey/Redis providers keep AND structure.
  • Add robustness tests handling local_mem0_config and vector_store set to None without errors.

^{Written by Cursor Bugbot for commit 13b48eb. This will update automatically on new commits. Configure here.}

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