* Add billing page with payment history and invoice download
- Add new BillingPage component with MUI table for payment display
- Add billing menu item to AdminLayout with Payment icon
- Add getPayments and getInvoice methods to dataProvider
- Implement invoice download functionality with proper error handling
- Add routing for /billing path
- Support for scheduler/{hash}/payments API endpoint
- Enhanced error handling for 500, 404, 401, 403 HTTP errors
- Loading states and user feedback for better UX
* update readme; add docs; small visual changes; make it fail on payments API errors
* WIP: add scheduler commands
* refactor scheduler commands page
* WIP on CRUD for ScheduledCommands
* more refactoring, finish CRUD On scheduled pages
* Add info text about Scheduler service
* Finish recurring commands add/edit
* add more texts
* fix server status behavior on not-loaded-yet state; adjust texts; lint fixes
* add link to the help pages in the commands palette
* Move Commands Panel to ServerSchedulesPage
* Rename Server Schedules to Server Actions
* more texts, a bit changed visual of the actions page, lint fix
* add docs
* fix tests
* Add UTC label to scheduled command create/edit
* WIP: Add server status and running process indicators
* Finish ServerStatusPage and ServerRunningProcess
* fix typos, add running process info to the server status page
* Remove ServerRunningProcess and integrate it into ServerStatusBadge
* remove divider in menu
* display time as started X minutes ago
* add documentation; clearly state what new components are; update readme
* change wording a bit, cross-link with docs/README.md
* use returned HTML
* Finish ServerStatus page and badges
* Fix types
* cleanup
* remove some code
* adjust config load
