Add version files and update imports for trip model; enhance error handling

lib/validators/trip_validator.dart

@@ -1,4 +1,4 @@
-import "../models/trip.dart";
+import "../models/operations/trip.dart";
 
 class TripValidator {
   static List<String> validate(Trip trip) {
@@ -14,15 +14,17 @@ class TripValidator {
       errors.add("Missing trip number");
     }
 
-    // Validate duty/running numbers
-    if (trip.dutyNumber.isEmpty || trip.runningNumber.isEmpty) {
-      errors.add("Missing duty or running number");
+    // Validate duty/bus-work numbers
+    if (trip.dutyNumber.isEmpty || trip.busWorkNumber.isEmpty) {
+      errors.add("Missing duty or bus work number");
     }
 
     // Validate actual departure time if provided
     if (trip.actualDepartureTime != null &&
         !RegExp(r"^\d{2}:\d{2}$").hasMatch(trip.actualDepartureTime!)) {
-      errors.add("Invalid actual departure time format: ${trip.actualDepartureTime}");
+      errors.add(
+        "Invalid actual departure time format: ${trip.actualDepartureTime}",
+      );
     }
 
     return errors;