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

modules/connectivity/cellular_backup.py

@@ -22,7 +22,7 @@ except ImportError:
 
 from modules.base import BaseModule
 
-logger = logging.getLogger("sensor.connectivity.cellular_backup")
+logger = logging.getLogger(__name__)
 
 # Default serial device for modem AT commands
 DEFAULT_MODEM_DEVICE = "/dev/ttyUSB2"