Replaced `.single()` with `.maybeSingle()` in multiple command files to handle cases where no record is found, and added a new /pricing route and navigation links to the UI.
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Updates bot.js to make Supabase integration optional, adds Sentinel security listeners, and modifies several commands to handle missing Supabase configurations gracefully. Also updates package.json and replit.md for new dependencies and features.
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Restores and registers previously missing commands such as /verify, /profile, /leaderboard, and others, alongside their associated functionality and the role management utilities.
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