Disable telnet in generated configs; mount templates volume

- Add "no ip telnet" to generated switch configs for security
- Bind-mount templates/ into the container (read-only) so template
  edits take effect without a rebuild, matching config.py/configs/

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CLfUJoQTaUePx1m1d2v2j9

docker-compose.yml

@@ -10,6 +10,7 @@ services:
     volumes:
       - ./config.py:/app/config.py:ro
       - ./configs:/configs
+      - ./templates:/app/templates:ro
     environment:
       - PYTHONUNBUFFERED=1
       - NOCODB_URL=http://nocodb:8080