Remove references to sensor proxy config fields in test cases.
Tests were calling Load() without setting PULSE_DATA_DIR, causing them to try to create /etc/pulse which fails in CI environments. - Skip TestLoad_Defaults if /etc/pulse doesn't exist - Add PULSE_DATA_DIR to tests that were missing it
- Fix deadlock and race conditions in internal/alerts - Add comprehensive error path tests for internal/config - Fix 401 handling in internal/api - Fix Docker Swarm task filtering test logic
