- Added new milestones for 'Transit Permit Uploaded' and 'Export Transport Document Issued' in the clearance milestone catalog.
- Implemented methods in ClearanceMilestoneService to skip milestones and complete them with metadata.
- Updated ContractBookingService to check boundary conditions before booking creation.
- Introduced new endpoints in ContractsController for uploading customs declarations, advising duty, and handling various document uploads.
- Enhanced the UI to support new clearance actions and display relevant components based on milestone statuses.
- Added `unplaced` method in `BookingNotifierService` to log warnings for bookings that cannot be placed on any train.
- Introduced `getAvailableDays` method in `TrainSchedulingService` to retrieve distinct days with open departures for a given route.
- Created `AvailableDaysQueryDto` for querying available days based on origin and destination yards.
- Updated `TrainSchedulingController` to expose an endpoint for available days.
- Modified frontend components to support day-level booking, allowing customers to select only a day without pinning to a specific train.
- Removed references to train schedules in booking forms and review steps, emphasizing day selection.
- Added a database migration to create an index for efficient querying of bookings by route and day.
