Feature: Audit logs

[SantiagoDePolonia]

Summary by CodeRabbit

• New Features

  • Optional audit logging of requests/responses (including streaming usage) and provider identifiers on responses.

• Configuration

  • New env/config options to choose storage backend (SQLite/Postgres/MongoDB) and control logging (enable, backend, bodies/headers, buffer, flush interval, retention, only-model-interactions).

• Chores

  • Docker Compose updated to include Postgres, MongoDB and Adminer plus logging-related env vars.

• Tests

  • Extensive unit and end-to-end tests for audit logging, redaction, streaming, and concurrency.

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