feat: extend equipment and workout models with service tracking

internal/equipment/service.go

@@ -71,6 +71,12 @@ func (s *Service) UpdateEquipment(id, userID uint, updates map[string]interface{
 	if active, ok := updates["active"].(bool); ok {
 		equipment.Active = active
 	}
+	if v, ok := updates["service_interval_distance"].(float64); ok {
+		equipment.ServiceIntervalDistance = v
+	}
+	if v, ok := updates["service_interval_duration"].(float64); ok {
+		equipment.ServiceIntervalDuration = int(v)
+	}
 
 	if err := s.repo.UpdateEquipment(equipment); err != nil {
 		return nil, err
@@ -83,6 +89,29 @@ func (s *Service) DeleteEquipment(id, userID uint) error {
 	return s.repo.DeleteEquipment(id, userID)
 }
 
+// IncrementMileage adds distance (km) and duration (seconds) to equipment totals.
+func (s *Service) IncrementMileage(equipmentID, userID uint, distance float64, duration int) error {
+	return s.repo.IncrementMileage(equipmentID, userID, distance, duration)
+}
+
+// RecordService resets the service counters and records the service date.
+func (s *Service) RecordService(equipmentID, userID uint) (*Equipment, error) {
+	if err := s.repo.ResetServiceCounters(equipmentID, userID); err != nil {
+		return nil, err
+	}
+	return s.repo.GetEquipmentByID(equipmentID, userID)
+}
+
+// GetServiceStatus returns the service status for a piece of equipment.
+func (s *Service) GetServiceStatus(equipmentID, userID uint) (*ServiceStatus, error) {
+	eq, err := s.repo.GetEquipmentByID(equipmentID, userID)
+	if err != nil {
+		return nil, err
+	}
+	status := eq.GetServiceStatus()
+	return &status, nil
+}
+
 // Training Zones calculation
 func (s *Service) CalculateHRZones(maxHR, restingHR int) *HRZones {
 	if maxHR <= 0 {