Adding host def for openalex

[whitead]

see title

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Note

Extracts OPENALEX_HOST and constructs OPENALEX_BASE_URL from it in the OpenAlex client.

• Clients/OpenAlex:
  • Define OPENALEX_HOST and derive OPENALEX_BASE_URL from it.

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[dosubot]

Related Documentation

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[Copilot]

Pull Request Overview

This PR extracts the OpenAlex host into a separate constant to improve configurability and maintainability. The base URL construction is now more explicit and allows for easier host override if needed.

• Extracted OPENALEX_HOST constant from the hardcoded URL string
• Refactored OPENALEX_BASE_URL to use f-string formatting with the new constant

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[Copilot]

[nitpick] The newly introduced OPENALEX_HOST constant appears to be unused outside of constructing OPENALEX_BASE_URL. If the intent is to allow host configuration via environment variables (similar to OPENALEX_API_REQUEST_TIMEOUT), consider adding support for this. Otherwise, this intermediate constant adds unnecessary indirection without clear benefit. Recommend either removing it and reverting to the original single-line definition, or documenting its purpose if it's intended for future extensibility.