- Added a new cities table to the database to manage multiple cities independently.
- Created a middleware to resolve city context based on X-City-Id header.
- Updated routes and services to handle city-specific data for routes, stops, and alerts.
- Implemented a CityContext in the frontend to manage active city state and provide city data across the application.
- Added a CitySelector component for users to switch between cities.
- Created a CitiesPage for admins to manage cities, including adding new cities with validation.
- Updated various components and pages to reflect the active city context, ensuring data is displayed correctly based on the selected city.
- Enhanced the schedule import functionality to restrict imports based on the active city.
