🗃️ Add nonce column to chat messages and fix column typo

This migration adds a new "nonce" column to the "chat_messages" table to ensure message uniqueness or integrity. Additionally, it corrects a typo in the "members_mentioned" column name to improve consistency and clarity.

DysonNetwork.Sphere/Migrations/20250503032932_AddChatMessageNonce.cs

@@ -0,0 +1,39 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace DysonNetwork.Sphere.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddChatMessageNonce : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.RenameColumn(
+                name: "members_metioned",
+                table: "chat_messages",
+                newName: "members_mentioned");
+
+            migrationBuilder.AddColumn<string>(
+                name: "nonce",
+                table: "chat_messages",
+                type: "text",
+                nullable: false,
+                defaultValue: "");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "nonce",
+                table: "chat_messages");
+
+            migrationBuilder.RenameColumn(
+                name: "members_mentioned",
+                table: "chat_messages",
+                newName: "members_metioned");
+        }
+    }
+}