feat: add ServiceTicket and TicketNote models

Models/ServiceTicket.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+
+namespace Disco.Plugins.ServiceTracker.Models
+{
+    /// <summary>
+    /// Extended ticket metadata stored alongside Disco Job records.
+    /// Links to a Disco Job by JobId.
+    /// </summary>
+    public class ServiceTicket
+    {
+        public int JobId { get; set; }
+        public string PriorityId { get; set; }
+        public string LocationId { get; set; }
+        public string AssignedTechId { get; set; }
+        public DateTime? EstimatedCompletion { get; set; }
+        public DateTime? SlaDeadline { get; set; }
+        public string StatusOverride { get; set; }
+        public string Summary { get; set; }
+        public List<TicketNote> Notes { get; set; }
+        public DateTime CreatedDate { get; set; }
+        public DateTime LastModifiedDate { get; set; }
+        public string LastModifiedBy { get; set; }
+
+        public ServiceTicket()
+        {
+            Notes = new List<TicketNote>();
+            CreatedDate = DateTime.Now;
+            LastModifiedDate = DateTime.Now;
+        }
+    }
+
+    public class TicketNote
+    {
+        public string Id { get; set; }
+        public string AuthorId { get; set; }
+        public string AuthorName { get; set; }
+        public DateTime Timestamp { get; set; }
+        public string Content { get; set; }
+        public string NoteType { get; set; } // "update", "escalation", "resolution", "general"
+
+        public TicketNote()
+        {
+            Id = Guid.NewGuid().ToString("N").Substring(0, 8);
+            Timestamp = DateTime.Now;
+            NoteType = "general";
+        }
+    }
+}