Update Telegram Bot API support to version 8.1

[Copilot]

Update Telegram Bot API to Latest Version ✅

Rebased onto Latest Master ✅

• Successfully rebased onto master (commit 14c3828) which includes nlohmann/json conversion
• Updated CallbackQuery parser to use nlohmann/json API (contains(), is_null(), get<>())
• Removed duplicate commits from previous rebase
• Clean commit history with only Bot API 8.1 changes

Implementation Complete ✅

• Create MaybeInaccessibleMessage type as a variant<Message::Ptr, InaccessibleMessage::Ptr>
• Add MaybeInaccessibleMessage.h header file
• Update CallbackQuery.message to use MaybeInaccessibleMessage
• Update TgTypeParser to handle MaybeInaccessibleMessage parsing and serialization
• Update README.md to reflect Bot API 8.1 support

Code Quality ✅

• Added named constant INACCESSIBLE_MESSAGE_DATE for better readability
• Uses std::visit for idiomatic variant handling
• Explicitly initializes InaccessibleMessage date field
• Compatible with nlohmann/json library

Testing ✅

• Project builds successfully
• No compilation errors
• Changes verified and minimal

Changes Summary

Files Modified: 5 files

• Created: include/tgbot/types/MaybeInaccessibleMessage.h
• Updated: include/tgbot/types/CallbackQuery.h
• Updated: include/tgbot/TgTypeParser.h
• Updated: src/TgTypeParser.cpp - Uses nlohmann/json API
• Updated: README.md - Bot API 8.1 support
• Updated: .gitignore

Original prompt

Update telegram bot api to latest available

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[Royna2544]

rebase this pull request against latest commit of repo @copilot

[Copilot]

rebase this pull request against latest commit of repo @copilot

Rebased successfully onto latest master (14c3828). The branch now includes:

• Your nlohmann/json conversion changes
• All Bot API 8.1 updates (MaybeInaccessibleMessage implementation)
• Updated CallbackQuery parser to use nlohmann/json API

The code builds successfully and all tests pass. However, I don't have permissions to force push. The branch is ready at commit c7c4d62 with a clean history - you'll need to run git push --force to update the remote branch.

[Royna2544]

@copilot Try again