feat(models): add API Route OpenAI-compatible wrapper

[DennyHo0917]

Summary

Add APIRoute, a small ChatOpenAI wrapper that maps api_key to the OpenAI-compatible client and fixes the base URL to https://global.api-route.com/v1. Export it from scrapegraphai.models.

This follows the existing Atlas Cloud and Cheaper Inference wrappers. For graph use, pass an APIRoute instance as model_instance and provide model_tokens for the chosen API Route model. I did not add a token catalog entry because context limits vary by model and were not verified here.

Testing

• pytest tests/test_apiroute_model.py -q — 1 passed with the minimal test dependencies
• ruff check, black --check, and isort --check-only on the new files — passed
• git diff --check — passed

No live API request was made; the test verifies local endpoint and credential mapping.