Strip OPSEC tool identity fingerprints

Replace all sensor.* logger namespaces with __name__ (generic module
identifiers instead of discoverable 'sensor.*' prefixes).

Change hardcoded 'bb' API user to 'admin' in config and code defaults.

Change hardcoded relay_user 'bb' to 'operator' — prevents network
profiling from exposing tool identity via SSH config.

Fixes #457, #458, #459

utils/credential_encryption.py

@@ -6,7 +6,7 @@ import json
 import logging
 from typing import Optional
 
-logger = logging.getLogger("sensor.credential_encryption")
+logger = logging.getLogger(__name__)
 
 # Cache the key in memory during module lifetime
 _cached_key: Optional[bytes] = None