Introduce authentication framework with AuthConfig, AuthGate, and Authenticator classes, alongside comprehensive tests for rules, modes, and schemes.

src/main/java/dev/coph/nextusweb/server/websocket/WebSocketGroup.java

@@ -1,6 +1,7 @@
 package dev.coph.nextusweb.server.websocket;
 
 import dev.coph.nextusweb.server.json.JsonMapper;
+import io.netty.buffer.Unpooled;
 import io.netty.channel.group.ChannelGroup;
 import io.netty.channel.group.DefaultChannelGroup;
 import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
@@ -102,8 +103,9 @@ public final class WebSocketGroup {
     public WebSocketGroup broadcastJson(Object value) {
         try {
             byte[] bytes = JsonMapper.MAPPER.writeValueAsBytes(value);
-            String text = new String(bytes, java.nio.charset.StandardCharsets.UTF_8);
-            channels.writeAndFlush(new TextWebSocketFrame(text));
+            // Build the text frame straight from the serialized UTF-8 bytes; the channel group
+            // duplicates the payload per recipient, so no String round-trip re-encode is needed.
+            channels.writeAndFlush(new TextWebSocketFrame(Unpooled.wrappedBuffer(bytes)));
         } catch (JacksonException e) {
             throw new RuntimeException("JSON serialization failed", e);
         }