Added Type, Category and Signatories on task

lib/models/task.dart

@@ -14,6 +14,13 @@ class Task {
     required this.creatorId,
     required this.startedAt,
     required this.completedAt,
+    // new optional metadata fields
+    this.requestedBy,
+    this.notedBy,
+    this.receivedBy,
+    this.requestType,
+    this.requestTypeOther,
+    this.requestCategory,
   });
 
   final String id;
@@ -29,6 +36,16 @@ class Task {
   final DateTime? startedAt;
   final DateTime? completedAt;
 
+  // Optional client/user metadata
+  final String? requestedBy;
+  final String? notedBy;
+  final String? receivedBy;
+
+  /// Optional request metadata added later in lifecycle.
+  final String? requestType;
+  final String? requestTypeOther;
+  final String? requestCategory;
+
   factory Task.fromMap(Map<String, dynamic> map) {
     return Task(
       id: map['id'] as String,
@@ -47,6 +64,12 @@ class Task {
       completedAt: map['completed_at'] == null
           ? null
           : AppTime.parse(map['completed_at'] as String),
+      requestType: map['request_type'] as String?,
+      requestTypeOther: map['request_type_other'] as String?,
+      requestCategory: map['request_category'] as String?,
+      requestedBy: map['requested_by'] as String?,
+      notedBy: map['noted_by'] as String?,
+      receivedBy: map['received_by'] as String?,
     );
   }
 }