Northline RP Community Portal v2.9.29

Build hotfix

• Fixed the Ban List build error by passing the feature visibility state into each ban card.

Discord webhook notifications

• Added secure server-side Discord webhook support using environment variables only.
• Added Status Notifier embeds when staff post a public status update.
• Added New Web Registration embeds the first time a Steam account claims/signs into a website profile.
• Registration embeds include whether that Steam account has existing server save data before website login.
• Added Admin Audit embeds for status edits/removals, maintenance settings, site feature toggles, Daily Drops changes, Tweeter account restrictions, and Tweeter filter-word changes.
• Added Discord webhook documentation in docs/discord-webhooks.md.
• Added webhook variable placeholders to .env.example without committing webhook secrets.