Update API docs to match OpenAPI spec: latitude/longitude only

[Copilot]

The API documentation claimed the HTTP endpoints accept coordinate aliases (lat, lon, lng), but the OpenAPI spec only defines latitude and longitude as valid parameters. Requests using aliases are rejected by the validator before reaching handlers.

Changes:

• Removed all references to coordinate aliases from API README
• Updated curl examples to use latitude and longitude

Note: The main neaps library (not the HTTP API) continues to support aliases via GeolibInputCoordinates. Only the HTTP API endpoints are restricted to the full parameter names.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (527ef53) to head (948c9d2).
⚠️ Report is 6 commits behind head on copilot-worktree-2026-01-20T12-42-16.

Additional details and impacted files

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##           copilot-worktree-2026-01-20T12-42-16      #195   +/-   ##
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  Coverage                                100.00%   100.00%           
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  Files                                        67        67           
  Lines                                       595       595           
  Branches                                     77        77           
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  Hits                                        595       595           

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