Fix #4423: Auto-parse JSON string config in Mem0Storage

[devin-ai-integration]

Fix #4423: Auto-parse JSON string config in Mem0Storage

Summary

Mem0Storage crashes with AttributeError: 'str' object has no attribute 'get' when config is provided as a JSON string instead of a dict. This is common when configs are loaded from environment variables, CLI arguments, or config files.

The fix adds a _parse_config static method that:

• Passes dict configs through unchanged (existing behavior)
• Auto-parses valid JSON strings into dicts
• Raises clear TypeError messages for invalid JSON strings, JSON that doesn't decode to a dict, or unsupported types (e.g. int)

Review & Testing Checklist for Human

• Verify the behavior change for empty string "" config is acceptable — previously config or {} would silently convert it to {}, now it raises TypeError since "" is not valid JSON. This is arguably stricter but more correct.
• Confirm TypeError is the right exception type for all three error cases (invalid JSON, non-dict JSON, wrong type). Could argue ValueError for the JSON decode failure.
• Quick smoke test: pass a JSON string config like '{"agent_id":"x","user_id":"y"}' to Mem0Storage(type="external", config=...) and verify it initializes correctly end-to-end.

Notes

• Requested by: João
• Link to Devin run

[devin-ai-integration]

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[devin-ai-integration]

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