build(auth): bump dcntrlized-auth to v0.1.5 (DCNTRLIZED_DEBUG flag)

Renames the server-side plaintext escape hatch from INSECURE_INTERNAL to
DCNTRLIZED_DEBUG in the debug compose and the listener log line; bumps the
shared auth module.

docker-compose.debug.yaml

@@ -50,7 +50,7 @@ services:
       # Security theme M2 §2: keep THIS listener plaintext so the RN client
       # (direct mode) and hot reload work without certs. The auth proxy edge
       # is still mTLS (mounted identity above).
-      - INSECURE_INTERNAL=1
+      - DCNTRLIZED_DEBUG=true
       # Application configuration
       # - PORT=8080
       # - ENVIRONMENT=development