VSN-2251:Feature/establishment suivi courses

Objective

Add the backend support needed by the establishment Suivi des courses screen for:

• today's course list
• Détails du trajet
• Informations sur le chauffeur et le véhicule

Implemented

• added the additive establishment details endpoint:
  • GET /api/circuit/trip/establishment/{establishmentUuid}/today-courses/{tripId}/details
• kept the existing establishment today-courses list endpoint
• added a dedicated response DTO for establishment trip details
• resolved real pickup and dropoff points from trip points and trip direction
• returned:
  • departure time
  • estimated arrival time
  • estimated duration
  • derived UI status
  • pickup label/time/coordinates
  • dropoff label/time/coordinates
  • driver identity and contact
  • optional driver photo URL
  • vehicle label and license plate
• reused existing driver/vehicle resolution through user-service
• kept the change additive to avoid impacting existing consumers