Add SSE client for web chat integration and enable event-based message handling.

- Introduced `SseSubscribeClient` to connect to the external web server and process events via SSE (Server-Sent Events).
- Added `WebHandler` interface for type-safe event deserialization and processing.
- Included `WebChatHandler` to handle incoming web chat messages and forward them to the chat system.
- Updated `Config` for new configurable values: `CHAT_WEB_REGISTER_TO_BASE_URL` and `CHAT_WEB_TOKEN`.

galaxy/src/main/java/com/alttd/chat/ChatPlugin.java

@@ -1,6 +1,7 @@
 package com.alttd.chat;
 
 import com.alttd.chat.chat_web.ChatMessageSender;
+import com.alttd.chat.chat_web.handlers.WebChatHandler;
 import com.alttd.chat.commands.*;
 import com.alttd.chat.config.Config;
 import com.alttd.chat.config.ServerConfig;
@@ -15,6 +16,8 @@ import com.alttd.chat.objects.chat_log.ChatLogHandler;
 import com.alttd.chat.util.ALogger;
 import com.alttd.chat.util.ServerName;
 import com.alttd.chat.util.Utility;
+import com.alttd.chat.web.SseSubscribeClient;
+import lombok.Getter;
 import org.bukkit.Bukkit;
 import org.bukkit.command.CommandExecutor;
 import org.bukkit.event.Listener;
@@ -24,12 +27,15 @@ import java.util.Objects;
 
 public class ChatPlugin extends JavaPlugin {
 
+    @Getter
     private static ChatPlugin instance;
 
     private ChatAPI chatAPI;
+    @Getter
     private ChatHandler chatHandler;
 
     private ServerConfig serverConfig;
+    private SseSubscribeClient sseSubscribeClient;
 
     @Override
     public void onEnable() {
@@ -78,10 +84,23 @@ public class ChatPlugin extends JavaPlugin {
         getServer().getMessenger().registerIncomingPluginChannel(this, messageChannel, nicknamesEvents);
         getServer().getPluginManager().registerEvents(nicknamesEvents, this);
         registerCommand("nick", new Nicknames());
+
+        sseSubscribeClient = new SseSubscribeClient(
+                Config.CHAT_WEB_REGISTER_TO_BASE_URL,
+                getServer().getServerName(),
+                Config.CHAT_WEB_TOKEN
+        );
+        new Thread(sseSubscribeClient).start();
+        registerWebHandlers(chatMessageSender, sseSubscribeClient);
+    }
+
+    private void registerWebHandlers(ChatMessageSender chatMessageSender, SseSubscribeClient sseSubscribeClient) {
+        sseSubscribeClient.register("web_chat", new WebChatHandler(chatMessageSender));
     }
 
     @Override
     public void onDisable() {
+        sseSubscribeClient.stop();
         instance = null;
     }
 
@@ -95,14 +114,6 @@ public class ChatPlugin extends JavaPlugin {
         Objects.requireNonNull(getCommand(commandName)).setExecutor(commandExecutor);
     }
 
-    public static ChatPlugin getInstance() {
-        return instance;
-    }
-
-    public ChatHandler getChatHandler() {
-        return chatHandler;
-    }
-
     public boolean serverGlobalChatEnabled() {
         return serverConfig.GLOBALCHAT;
     }

galaxy/src/main/java/com/alttd/chat/chat_web/handlers/WebChatHandler.java

@@ -0,0 +1,24 @@
+package com.alttd.chat.chat_web.handlers;
+
+import com.alttd.chat.chat_web.ChatMessageSender;
+import com.alttd.chat.web.WebHandler;
+import com.alttd.chat.web.handler_class.ChatFromWeb;
+
+public class WebChatHandler implements WebHandler<ChatFromWeb> {
+
+    private final ChatMessageSender chatMessageSender;
+
+    public WebChatHandler(ChatMessageSender chatMessageSender) {
+        this.chatMessageSender = chatMessageSender;
+    }
+
+    @Override
+    public Class<ChatFromWeb> type() {
+        return ChatFromWeb.class;
+    }
+
+    @Override
+    public void handle(ChatFromWeb chatFromWeb) {
+        this.chatMessageSender.sendMessage(chatFromWeb.getSender(), chatFromWeb.getMessage());
+    }
+}