Enable pgcrypto extension for gen_random_uuid() in AddDefaultAdminRole migration

Co-authored-by: kbeaugrand <9513635+kbeaugrand@users.noreply.github.com>

Author: Copilot

src/IoTHub.Portal.Postgres/Migrations/20260107100522_AddDefaultAdminRole.cs

@@ -13,6 +13,9 @@ public partial class AddDefaultAdminRole : Migration
         /// <inheritdoc />
         protected override void Up(MigrationBuilder migrationBuilder)
         {
+            // Enable pgcrypto extension for gen_random_uuid() function
+            _ = migrationBuilder.Sql("CREATE EXTENSION IF NOT EXISTS pgcrypto;");
+
             // Add role with all permissions
             _ = migrationBuilder.Sql(
                 @"