feat: add configurable request timeout

[tnware]

Summary

• Adds a request_timeout constructor option for controller HTTP requests.
• Applies the configured timeout to authentication, GET requests, and generic mutating/API requests.
• Keeps backward compatibility by defaulting to None, preserving requests' existing no-timeout behavior unless users opt in.
• Documents the option in README and API docs.

Test Plan

• ruff check .
• pytest -q
• python -m build
• twine check dist/*
• sphinx-build -E -W -b html docs docs/_build/html
• git diff --check

Notes

This is the next small runtime-safety PR after API-level error handling. It avoids changing default behavior while giving users a power/safety knob to prevent indefinitely hanging controller calls.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c136ba33-4201-4171-ad1b-30edbbf7f1e1

📥 Commits

Reviewing files that changed from the base of the PR and between 0ba396f and e04b7ce.

📒 Files selected for processing (5)

• README.md
• docs/api/client.rst
• docs/index.rst
• tests/test_request_timeout.py
• unifi_controller_api/api_client.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/request-timeout-support

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