Introduce support for web chat integration.

- Replaced synchronous permission checks with asynchronous LuckPerms user loading.
- Added `getOrLoadUser` utility to simplify user-related operations.
- Introduced web-originated chat command processing via new `PunishmentCommandBuilder` and `PunishFromWebHandler`.
- Updated `MuteServer`, `ToggleGlobalChat`, and `ToggleableForCustomChannel` to use async permission checks.
- Added test suite for `PunishmentCommandBuilder`.
- Expanded chat handling to process party messages from web events.

velocity/src/main/java/com/alttd/velocitychat/VelocityChat.java

@@ -10,6 +10,9 @@ import com.alttd.chat.objects.ChatUser;
 import com.alttd.chat.objects.chat_log.ChatLogHandler;
 import com.alttd.chat.objects.chat_log.WebHandler;
 import com.alttd.chat.util.ALogger;
+import com.alttd.chat.web.SseSubscribeClient;
+import com.alttd.velocitychat.chat_web.handlers.PunishFromWebHandler;
+import com.alttd.velocitychat.chat_web.handlers.WebPartyChatHandler;
 import com.alttd.velocitychat.commands.*;
 import com.alttd.velocitychat.handlers.ChatHandler;
 import com.alttd.velocitychat.handlers.ServerHandler;
@@ -50,6 +53,7 @@ public class VelocityChat {
     private ServerHandler serverHandler;
 
     private ChannelIdentifier channelIdentifier;
+    private SseSubscribeClient sseSubscribeClient;
 
     @Inject
     public VelocityChat(ProxyServer proxyServer, Logger proxyLogger, @DataDirectory Path proxydataDirectory) {
@@ -71,7 +75,7 @@ public class VelocityChat {
         WebHandler webHandler = new WebHandler();
 
         ChatLogHandler chatLogHandler = new ChatLogHandler(webHandler, true);
-        chatHandler = new ChatHandler(chatLogHandler);
+        chatHandler = new ChatHandler(chatLogHandler, chatAPI.getLuckPerms());
         server.getEventManager().register(this, new ChatListener());
         server.getEventManager().register(this, new ProxyPlayerListener());
         new LiteBansListener().init(); // init the litebans api listeners
@@ -84,6 +88,18 @@ public class VelocityChat {
         ChatUser console = new ChatUser(Config.CONSOLEUUID, -1, null);
         console.setDisplayName(Config.CONSOLENAME);
         ChatUserManager.addUser(console);
+        sseSubscribeClient = new SseSubscribeClient(
+                Config.CHAT_WEB_REGISTER_TO_BASE_URL,
+                "proxy", //TODO [Stijn] [2026-08-09]: Make configurable if needed
+                Config.CHAT_WEB_TOKEN
+        );
+        new Thread(sseSubscribeClient).start();
+        registerWebHandlers(sseSubscribeClient);
+    }
+
+    private void registerWebHandlers(SseSubscribeClient sseSubscribeClient) {
+        sseSubscribeClient.register("web_party_chat", new WebPartyChatHandler(chatHandler));
+        sseSubscribeClient.register("web_punish", new PunishFromWebHandler(server));
     }
 
     public void reloadConfig() {