feat: Support Bot API 9.6 & 10.0, multipart fixes — closes #279 #280, fixes #273 #274 #271 #277

[Zoomish]

Summary

This PR brings the client in line with Bot API 9.6 (April 3, 2026) and Bot API 10.0 (May 8, 2026), fixes several open bugs, and adjusts request building where the API now expects different shapes or extra attachments.

Bot API 9.6 - managed bots & polls ( #279 )

• User: can_manage_bots.
• Keyboard: KeyboardButtonRequestManagedBot (request_id, optional suggested_name, suggested_username) and KeyboardButton.request_managed_bot.
• Updates: Update.managed_bot as ManagedBotUpdated (includes user and bot per API).
• Messages: managed_bot_created (ManagedBotCreated), poll_option_added / poll_option_deleted with structures matching the API (poll_message, option_persistent_id, option_text, option_text_entities).
• Methods: getManagedBotToken, replaceManagedBotToken (returns new token string), savePreparedKeyboardButton (user_id + KeyboardButton), response type PreparedKeyboardButton with id only; parameter JSON uses documented field names (e.g. user_id for managed-bot calls).
• Polls: Poll / PollOption / PollAnswer updated for quizzes with multiple correct answers (correct_option_ids), optional revoting, descriptions, persistent_id / option_persistent_ids, option attribution and addition_date; SendPollParams extended (correct_option_ids, description/media/explanation fields, members_only, country_codes, revote/shuffle/add-options/hide-results flags, etc.).
• Replies: ReplyParameters.poll_option_id and Message.reply_to_poll_option_id use string persistent identifiers as in the API.

Bot API 10.0 - guest mode, reactions admin, polls/media, live photos, access settings ( #280 )

• Guest mode: User.supports_guest_queries; Message guest fields (guest_bot_caller_user, guest_bot_caller_chat, guest_query_id); Update.guest_message; answerGuestQuery with guest_query_id + result (InlineQueryResult); SentGuestMessage with inline_message_id.
• Chat permissions / members: can_react_to_messages on ChatPermissions and ChatMemberRestricted; getChatAdministrators gains optional return_bots.
• Reactions moderation: deleteMessageReaction (chat_id, message_id, optional user_id, actor_chat_id) and deleteAllMessageReactions (chat_id, optional user_id, actor_chat_id) - aligned with the current method tables (not the older reaction / message_id mistake).
• Polls & media: PollMedia; Poll / PollOption incoming media fields; SendPollParams media / explanation_media via InputMedia (InputPollMedia union); InputPollOption embeds typed media in JSON via custom marshal; new InputMediaSticker, InputMediaLocation, InputMediaVenue; existing InputMediaLivePhoto completed (photo, has_spoiler, attachments for multipart).
• Live photos: sendLivePhoto (live_photo + photo files, captions, etc.); LivePhoto and paid variants (PaidMediaLivePhoto, InputPaidMediaLivePhoto) for sending/receiving; Message / ExternalReplyInfo live_photo; multipart builder handles a second attach:// for live-photo payloads where needed.
• Service messages: JSON keys for scheduled video chats use video_chat_* (replacing deprecated voice_chat_* keys on Message).
• Managed bot access & DMs: BotAccessSettings; getManagedBotAccessSettings / setManagedBotAccessSettings; getUserPersonalChatMessages (user_id, required limit).

Bugfixes & ergonomics

• SendChecklistParams.ChatID and some other params chat id field has wrong type int instead of int64 #273
• Panic in addFormFieldInputFileUpload when InputFileUpload.Data holds a struct value (e.g. multipart.File from FormFile) #274
• Bug with CanSendOtherMessages variable #271
• Bot.ID(): silent return of 0 on invalid or malformed token #277

Breaking changes

• Poll / SendPollParams: correct_option_id → correct_option_ids ([]int).
• Reaction deletion methods: parameter sets replaced with API-accurate user_id / actor_chat_id (and deleteAllMessageReactions no longer takes message_id).
• Poll option service payloads & reply IDs: PollOptionAdded / PollOptionDeleted reshaped; poll_option_id / reply_to_poll_option_id are strings.
• Message: service fields for video chats use video_chat_* JSON keys.
• Various *Params: stricter or wider chat-id types (int64, any) - callers passing channel/usernames or large IDs should verify compile-time types.

Test plan - 3/3 ✅

• go build ./...
• go vet ./...
• go test ./...

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 22.85714% with 108 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.50%. Comparing base (f20f4ff) to head (f3b5003).

Files with missing lines	Patch %	Lines
models/input_media.go	0.00%	52 Missing ⚠️
methods.go	0.00%	40 Missing ⚠️
build_request_form.go	42.85%	10 Missing and 2 partials ⚠️
models/poll.go	77.77%	2 Missing and 2 partials ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #281      +/-   ##
==========================================
- Coverage   45.50%   44.50%   -1.01%     
==========================================
  Files          29       30       +1     
  Lines        2138     2274     +136     
==========================================
+ Hits          973     1012      +39     
- Misses       1111     1205      +94     
- Partials       54       57       +3     

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[negasus]

Also, please, use gofmt before send PR

[Zoomish]

Also, please, use gofmt before send PR

Done — ran gofmt on the whole tree and pushed