WIP: introduce transport-aware client core

[createMonster]

Summary

• introduce SanClient and ClientConfig as the new client-based core
• route module-level APIs through a default client while keeping backward compatibility
• reuse the existing transport-backed GraphQL execution path so retries, timeouts, and typed errors remain intact
• add tests for explicit client usage, compatibility with ApiConfig.api_key, and transport error mapping

Notes

• supersedes WIP: introduce client-based core API #199, which was based on an outdated local master

Validation

• pytest san/tests -q

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