muthukumaran R a0ff173799
[feat] engines: add OpenAlex Works engine (#5102)
- Adds a new engine `searx/engines/openalex.py` that integrates the OpenAlex
  Works API to return scientific paper results using the `paper.html` template.
- Uses the official API (no auth required); supports OpenAlex polite pool via `mailto`.
- Adds developer docs at `docs/dev/engines/online/openalex.rst`.

OpenAlex API reference: https://docs.openalex.org/how-to-use-the-api/api-overview
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