Add XML documentation across gateway, worker, and .NET client

src/MxGateway.Server/Security/Authentication/AuthSqliteConnectionFactory.cs

@@ -4,8 +4,14 @@ using MxGateway.Server.Configuration;
 
 namespace MxGateway.Server.Security.Authentication;
 
+/// <summary>
+/// Factory for creating SQLite connections to the authentication store.
+/// </summary>
 public sealed class AuthSqliteConnectionFactory(IOptions<GatewayOptions> options)
 {
+    /// <summary>
+    /// Creates and configures a SQLite connection to the auth database.
+    /// </summary>
     public SqliteConnection CreateConnection()
     {
         string sqlitePath = options.Value.Authentication.SqlitePath;