Improve help commands in the plugins

Standardise help output across the plugins.

Grounded: Business has a dedicated HelpCommands.java; Treasury has no unified help command (its commands carry @Description annotations but there's no /treasury help that lists them). Since commands are declared with Hibernia's @Route/@Description/@Permission, the framework can auto-generate consistent, permission-filtered help.

Add a reusable help generator in hibernia-framework that builds a paginated /x help from the registered routes' annotations, then wire it into each plugin (Treasury, Business, ChestShop) so help stays in sync with the actual commands instead of being hand-maintained.