feat: implement comprehensive Firebase Functions backend for equipment management and migrate core repository services

em2rp/lib/services/event_availability_service.dart

@@ -171,20 +171,37 @@ class EventAvailabilityService {
           for (var conflictData in containerConflicts) {
             final conflict = conflictData as Map<String, dynamic>;
             final eventId = conflict['eventId'] as String;
-            final eventDoc = await _dataService.getEvents();
-            final eventData = (eventDoc['events'] as List<dynamic>).firstWhere((e) => e['id'] == eventId, orElse: () => null);
-            if (eventData != null) {
-              final event = EventModel.fromMap(eventData as Map<String, dynamic>, eventId);
-              conflicts.add(AvailabilityConflict(
-                equipmentId: container.id,
-                equipmentName: container.name,
-                conflictingEvent: event,
-                overlapDays: conflict['overlapDays'] as int? ?? 0,
-                type: ConflictType.containerFullyUsed,
-                containerId: container.id,
-                containerName: container.name,
-              ));
-            }
+            final eventName = conflict['eventName'] as String? ?? '';
+            final startDateStr = conflict['startDate'] as String?;
+            final endDateStr = conflict['endDate'] as String?;
+            
+            final event = EventModel(
+              id: eventId,
+              name: eventName,
+              description: '',
+              startDateTime: startDateStr != null ? DateTime.tryParse(startDateStr) ?? DateTime.now() : DateTime.now(),
+              endDateTime: endDateStr != null ? DateTime.tryParse(endDateStr) ?? DateTime.now() : DateTime.now(),
+              basePrice: 0.0,
+              installationTime: 0,
+              disassemblyTime: 0,
+              eventTypeId: '',
+              customerId: '',
+              address: '',
+              latitude: 0.0,
+              longitude: 0.0,
+              workforce: const [],
+              documents: const [],
+            );
+            
+            conflicts.add(AvailabilityConflict(
+              equipmentId: container.id,
+              equipmentName: container.name,
+              conflictingEvent: event,
+              overlapDays: conflict['overlapDays'] as int? ?? 0,
+              type: ConflictType.containerFullyUsed,
+              containerId: container.id,
+              containerName: container.name,
+            ));
           }
         }
       }