Add API tests for the alerts endpoint

[alimaandev]

Summary

desktop/api_server.py has an alerts endpoint (\GET /api/v1/alerts, line ~444) that returns recent proactive alerts, but ests/test_api_server.py has no coverage for it. The TestMetrics, TestHealth, and other classes cover other endpoints.

Goal

Add a TestAlerts class in ests/test_api_server.py covering:

• \GET /api/v1/alerts\ returns 200 with an alerts list
• Requires auth (401 without a valid token)
• Works when the alerts store is empty (returns empty list, not an error)

Tasks

• Inspect the alert handler to confirm response shape (data/status/error envelope)
• Add the new test class following the existing patterns (app fixture, headers fixture)
• Run the suite: \python -m pytest tests/test_api_server.py --cov=desktop --cov-fail-under=40\

Acceptance criteria

• All three behaviors tested and passing
• No regressions in the rest of the suite
• CI coverage gate still passes (>=40% for api_server)

Labels

good first issue, help wanted