feat: update graph endpoint and add comprehensive query tests

[devin-ai-integration]

Graph Query Support Update

This PR updates the graph endpoint URL and adds comprehensive tests for all query types.

Changes

• Updated graph endpoint URL to point to the correct L2 manager endpoint
• Added comprehensive tests for all query types:
  • Lists queries
  • Sublists queries
  • Tokens queries
  • Addresses queries

Testing

The changes have been tested through the newly added test suite that verifies:

• Correct endpoint URL
• Proper query structure for all types
• Response format validation
• Data structure verification

Each test validates both the presence and structure of the expected data fields.

Link to Devin run: https://app.devin.ai/sessions/1a6dcae9259048ccbff94d6e4f81ff03

[devin-ai-integration]

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