Fix out-of-sync SDK content (key URL, browser env shape, agent ids)

[abonneth]

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Note

Low Risk
Documentation and test-only updates with no changes to SDK runtime logic in this diff.

Overview
Aligns user-facing docs and tests with the current platform and API shapes.

README now points “Get an API key” and setup instructions at platform.hcompany.ai/settings/api-keys instead of portal.hcompany.ai, and documents that the hai CLI also loads credentials from ~/.config/hai/.env (after --api-key, HAI_API_KEY, and a local .env).

The slow browser integration test provisions the environment as kind: "web" with mode: {"type": "visual", "width": ..., "height": ...} instead of local_browser with top-level width/height, and the docstring refers to web browser provisioning.

tests/test_answer_schema.py uses catalog agent id h/web-surfer-pro everywhere tests previously referenced h/web-surfer.

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