Deprecate what the API no longer has

Methods (per the API changelog and schema 0.0.33):
- getChats(): GET /chats is not supported since June 2026
- getChatByLink(), deleteChat(): no longer documented, absent from
  the schema
- addMembers(): POST /chats/{chatId}/members is limited since
  9 September 2026 and removed on 30 September 2026

Models and enums absent from schema 0.0.33: the chat inline button,
reply buttons and ReplyButtonType, Intent, MessageChatCreatedUpdate
and its handlers, Chat::$chatMessageId.

Only @deprecated tags and docs; nothing is removed, so existing code
keeps working until a major release. README coverage map updated.

src/Enums/Intent.php

@@ -4,6 +4,9 @@ declare(strict_types=1);
 
 namespace BushlanovDev\MaxMessengerBot\Enums;
 
+/**
+ * @deprecated Not part of the Bot API schema since 0.0.33.
+ */
 enum Intent: string
 {
     case Positive = 'positive';