Test: verify Honeygain collector works with expired JWT

[GeiserX]

Context

The Honeygain collector (app/collectors/honeygain.py) authenticates via JWT. When the JWT expires mid-collection, the collector should handle it gracefully.

Task

1. Write a test in tests/test_collectors.py that mocks an expired JWT response (401) from the Honeygain API
2. Verify the collector returns a sensible error value (not a crash)
3. Verify logs include a clear message about auth failure

Reference

• app/collectors/honeygain.py — current implementation
• app/collectors/base.py — BaseCollector interface