feat: implement emergency contact management with Firebase integration and relationship type handling

apps/mobile/packages/domain/lib/src/adapters/profile/emergency_contact_adapter.dart

@@ -0,0 +1,19 @@
+import '../../entities/profile/emergency_contact.dart';
+
+/// Adapter for [EmergencyContact] to map data layer values to domain entity.
+class EmergencyContactAdapter {
+  /// Maps primitive values to [EmergencyContact].
+  static EmergencyContact fromPrimitives({
+    required String id,
+    required String name,
+    required String phone,
+    String? relationship,
+  }) {
+    return EmergencyContact(
+      id: id,
+      name: name,
+      phone: phone,
+      relationship: EmergencyContact.stringToRelationshipType(relationship),
+    );
+  }
+}