Add /visitors/ blueprint with REST API endpoints for listing profiles and visits, labeling (with consent gate), household linking, ignore/unignore, and cascading forget. Register blueprint in app.py. Add dashboard and profile detail templates (Bootstrap 5 dark, tab navigation, fetch-based JS). All six API tests pass (339 total). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>