- Add CommentType field to Comments (customer, vendor, internal)
- Add Status field to EditWorkorder_DTO
- Create WorkOrderAuditLog model tracking field-level changes
- Log all field changes on work order edit and status change
- Include commentType and auditLog in GetWorkorderById response
- Set CommentType=customer on synced comments from DynamoDB
- Add BackfillCommentTypes endpoint for existing data