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.
