refactor(plugins): SPI workspace-only e remoção de menus legados

Remove GuiManager e pitiupi.models.Menus; atualiza chat/screencast, docs e testes (ConfigLoader, TcpConnectionManager).

Co-authored-by: Cursor <cursoragent@cursor.com>

plugins/chat/src/pitiupi/chat/GUI/ChatMenu.java

@@ -1,32 +0,0 @@
-/*
- * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
- * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
- */
-package pitiupi.chat.GUI;
-
-import pitiupi.models.Menus.MulticastMenus.MulticastMenu;
-import pitiupi.models.Menus.MulticastMenus.MulticastSubMenu;
-
-import java.util.List;
-
-/**
- *
- * @author flavio
- */
-public class ChatMenu extends MulticastSubMenu {
-    ChatMulticastMenu chatMulticastMenu;
-
-    public ChatMenu(ChatWindow chatWindow) {
-        this.chatMulticastMenu = new ChatMulticastMenu(chatWindow);
-    }
-
-    @Override
-    public String getText() {
-        return "Chat";
-    }
-
-    @Override
-    public List<MulticastMenu> getMenus() {
-        return List.of(chatMulticastMenu);
-    }
-}

plugins/chat/src/pitiupi/chat/GUI/ChatMulticastMenu.java

@@ -1,21 +0,0 @@
-package pitiupi.chat.GUI;
-
-import pitiupi.models.Menus.MulticastMenus.MulticastActionMenu;;
-
-public class ChatMulticastMenu extends MulticastActionMenu {
-    ChatWindow chatWindow;
-
-    public ChatMulticastMenu(ChatWindow chatWindow) {
-        this.chatWindow = chatWindow;
-    }
-
-    @Override
-    public String getText() {
-        return "Show Chat Window";
-    }
-
-    @Override
-    public void onClick() {
-        chatWindow.setVisible(true);
-    }
-}

plugins/chat/src/pitiupi/chat/plugin/ChatPlugin.java

@@ -12,7 +12,6 @@ import pitiupi.chat.control.PrivateChatHost;
 import pitiupi.chat.net.ChatMessage;
 import pitiupi.chat.net.LegacyMpChatMessage;
 import pitiupi.control.ConnectionManager;
-import pitiupi.control.GuiManager;
 import pitiupi.models.Messages.Message;
 import pitiupi.models.Plugin;
 import pitiupi.models.User;
@@ -44,10 +43,6 @@ public class ChatPlugin extends Plugin implements PrivateChatHost {
         installPeerActions(workspace.peerActions());
     }
 
-    @Override
-    public void createPlugin(ConnectionManager connectionManager, GuiManager guiManager) {
-    }
-
     @Override
     public void installPeerActions(PeerActionsRegistrar registrar) {
         registrar.register(PeerAction.of(