feat: Managed Bots support (Bot API 9.6)

Adds the types and methods for Telegram's Managed Bots feature, introduced
in Bot API 9.6 (April 2026): a bot with can_manage_bots can create and
control other bots via its own Bot API token, without BotFather's manual
/newbot flow or a separate credential per bot.

- User.CanManageBots (getMe)
- Update.ManagedBot / ManagedBotUpdated (creation, token update, or owner
  update of a managed bot)
- Message.ManagedBotCreated / ManagedBotCreated (service message for bot
  creation)
- BotAPI.GetManagedBotToken(userID) — fetch a managed bot's current token
- BotAPI.ReplaceManagedBotToken(userID) — rotate a managed bot's token

Doesn't add KeyboardButtonRequestManagedBot or savePreparedKeyboardButton
(the Mini App integration half of the same API bump) — happy to extend this
PR or follow up separately if there's interest.

Author: matvievsky

managed_bots.go

@@ -0,0 +1,37 @@
+package tgbotapi
+
+import (
+	"encoding/json"
+	"strconv"
+)
+
+// GetManagedBotToken retrieves the current token of a bot managed by this bot
+// (Bot API 9.6+, Managed Bots). userID is the managed bot's own id (bots are
+// Users in the Bot API's type system).
+func (bot *BotAPI) GetManagedBotToken(userID int64) (string, error) {
+	params := Params{"user_id": strconv.FormatInt(userID, 10)}
+
+	resp, err := bot.MakeRequest("getManagedBotToken", params)
+	if err != nil {
+		return "", err
+	}
+
+	var token string
+	err = json.Unmarshal(resp.Result, &token)
+	return token, err
+}
+
+// ReplaceManagedBotToken rotates the token of a bot managed by this bot,
+// invalidating the previous one (Bot API 9.6+, Managed Bots).
+func (bot *BotAPI) ReplaceManagedBotToken(userID int64) (string, error) {
+	params := Params{"user_id": strconv.FormatInt(userID, 10)}
+
+	resp, err := bot.MakeRequest("replaceManagedBotToken", params)
+	if err != nil {
+		return "", err
+	}
+
+	var token string
+	err = json.Unmarshal(resp.Result, &token)
+	return token, err
+}

types.go

@@ -114,6 +114,11 @@ type Update struct {
 	//
 	// optional
 	ChatJoinRequest *ChatJoinRequest `json:"chat_join_request,omitempty"`
+	// ManagedBot is the creation, token update, or owner update of a bot
+	// managed by the current bot (Bot API 9.6+, Managed Bots).
+	//
+	// optional
+	ManagedBot *ManagedBotUpdated `json:"managed_bot,omitempty"`
 }
 
 // SentFrom returns the user who sent an update. Can be nil, if Telegram did not provide information
@@ -217,6 +222,11 @@ type User struct {
 	//
 	// optional
 	SupportsInlineQueries bool `json:"supports_inline_queries,omitempty"`
+	// CanManageBots is true, if other bots can be created to be controlled
+	// by this bot (Bot API 9.6+, Managed Bots). Returned only in getMe.
+	//
+	// optional
+	CanManageBots bool `json:"can_manage_bots,omitempty"`
 }
 
 // String displays a simple text version of a user.
@@ -563,6 +573,11 @@ type Message struct {
 	//
 	// optional
 	MessageAutoDeleteTimerChanged *MessageAutoDeleteTimerChanged `json:"message_auto_delete_timer_changed,omitempty"`
+	// ManagedBotCreated is a service message: a bot was created to be
+	// managed by the current bot (Bot API 9.6+, Managed Bots).
+	//
+	// optional
+	ManagedBotCreated *ManagedBotCreated `json:"managed_bot_created,omitempty"`
 	// MigrateToChatID is the group has been migrated to a supergroup with the specified identifier.
 	// This number may be greater than 32 bits and some programming languages
 	// may have difficulty/silent defects in interpreting it.
@@ -1181,6 +1196,22 @@ type MessageAutoDeleteTimerChanged struct {
 	MessageAutoDeleteTime int `json:"message_auto_delete_time"`
 }
 
+// ManagedBotCreated contains information about a bot that was created to be
+// managed by the current bot (Bot API 9.6+, Managed Bots).
+type ManagedBotCreated struct {
+	// Bot is the newly created managed bot.
+	Bot User `json:"bot"`
+}
+
+// ManagedBotUpdated represents the creation, token update, or owner update of
+// a bot managed by the current bot (Bot API 9.6+, Managed Bots).
+type ManagedBotUpdated struct {
+	// User who owns the managed bot.
+	User User `json:"user"`
+	// Bot is the managed bot affected by this update.
+	Bot User `json:"bot"`
+}
+
 // VideoChatScheduled represents a service message about a voice chat scheduled
 // in the chat.
 type VideoChatScheduled struct {