chore: deploy dashboard from GitHub Actions

feat: period selector on Trends tab (week/month/3m/6m/12m/2y)

fix: filter noise tags (tautological + language duplicates) from all views

feat: add Trends tab (tag momentum, monthly repos, language trends)

dashboard: global filters, activity views, momentum, org/tag explorer

Deploy GovTech GitHub Explorer with logging + app_port fix