This commit removes the `avg_acceptance_rate` and `acceptance_rate` fields from both the `MiningDashboardService` and `WorkerService` classes. The changes simplify the data structures and calculations related to worker data, as acceptance rates are no longer tracked or displayed in the mining dashboard. This includes the removal of default values and random generation of acceptance rates for workers.
Updated the application to use a configurable timezone instead of hardcoding "America/Los_Angeles". This change impacts the dashboard, API endpoints, and worker services. Timezone is now fetched from a configuration file or environment variable, enhancing flexibility in time display. New API endpoints for available timezones and the current configured timezone have been added. The frontend now allows users to select their timezone from a dropdown menu, which is stored in local storage for future use. Timestamps in the UI have been updated to reflect the selected timezone.
