sync v1 prefix sdk

[yanxi0830]

What does this PR do?

• update SDK to reflect llamastack/llama-stack@b78e667

Test Plan

LLAMA_STACK_BASE_URL="http://localhost:5000" pytest -v tests/client-sdk/inference/test_inference.py

- these are pre-existing errors, doesn't impact v1 sdk sync

Sources

Please link relevant resources if necessary.

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Ran pre-commit to handle lint / formatting issues.
• Read the contributor guideline,
  Pull Request section?
• Updated relevant documentation.
• Wrote necessary unit or integration tests.