feat(assignment): add multiple trips assignment and advanced driver filtering

• Add findBestDriverForMultipleTrips() for ranking drivers across multiple selected trips
• Add createTripDriverAssignmentsForMultipleTrips() for batch trip assignments
• Add enrichScoresWithWorkingHours() to include working hours in driver ranking responses
• Add unassignDriverOverlappingAssignments() to handle automatic conflict resolution
• Refactor createTripDriverAssignmentForTrip() to control unassignment logic in batch operations
• Add emptyKm recalculation after assignment truncation or splitting
• Add getDriversByMultipleFilters() to combine multiple filter criteria (ALL, WITH_CIRCUIT, WITHOUT_CIRCUIT, WITH_APPLICATION)
• Modify getDriversWithCircuit() to filter drivers assigned exactly within specified period
• Add fetchWorkingHoursForDrivers() for batch working hours retrieval from HR service
• Integrate working hours and vehicle info into driver search response