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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Introduce several new slash commands including ban, kick, timeout, and userinfo. Enhance existing commands like config and rank with new features and configurations. Add new listeners for welcome and goodbye messages. Implement XP tracking for user leveling and integrate it with role rewards. Update documentation to reflect these changes.
Replit-Commit-Author: Agent
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