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/tailscale.py

@@ -19,7 +19,7 @@ from typing import Optional
 
 from modules.base import BaseModule
 
-logger = logging.getLogger("sensor.connectivity.tailscale")
+logger = logging.getLogger(__name__)
 
 TAILSCALE_BIN = "/usr/bin/tailscale"
 TAILSCALED_BIN = "/usr/sbin/tailscaled"