fix: surface UniFi API error payloads

[tnware]

Summary

• Treat UniFi API JSON error payloads (meta.rc == "error") as UnifiAPIError instead of returning empty data.
• Add focused response-processing tests for success, malformed data, and UniFi API-level errors.

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 first runtime safety follow-up after the maintainer-baseline PR. It is intentionally narrow: API-level failures returned as HTTP 200 should not be silently interpreted as successful empty data.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: a117284c-1d53-49f3-aab8-7972d8f168e3

📥 Commits

Reviewing files that changed from the base of the PR and between 820a70c and 80272ed.

📒 Files selected for processing (2)

• tests/test_api_response_handling.py
• unifi_controller_api/api_client.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/api-error-handling-baseline

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