Support two-way message replies and quotes for Telegram forum topics and webhooks

[mysubcult]

This PR adds reliable two-way reply and quote synchronization for Telegram forum topics and webhook messages.

What changed:

• Store Telegram message IDs and text/caption mappings per bot and group-chat namespace, preventing collisions between bots or destinations.
• Preserve local LHC quotes for every explicit Telegram reply, while only sending iwh_msg_id to REST when the target has a valid external ID.
• Read reply and quote data from both raw Telegram updates and installed telegram-core entities.
• Retry stale reply targets without losing multipart file payloads; reopen local files before retrying.
• Split long HTML/plain messages on UTF-16 limits without breaking UTF-8 characters, and keep the reply target only on the first chunk.
• Keep captions and media metadata available for later quote fallback, including legacy records.

Validation:

• PHP 8.4 lint passed for the extension files.
• tests/TelegramReplyContractTest.php passed, including namespace isolation, captions, UTF-16 splitting, stale-reply multipart retry, and compatibility fixtures.
• No Live Helper Chat core files are changed by this PR.

[mysubcult]

Hi @remdex,

Apologies for the previous branch state — some leftover static paths from an older dev commit accidentally slipped in earlier.

I have completely cleaned up the branch and rebased it directly onto clean master as a single commit:

• Removed all static/hardcoded paths: uses standard LHC $file->file_path_server and Longman\TelegramBot\Request::encodeFile().
• Cleaned quote formatting: uses standard LHC [quote=ID] BBCode without any extra emojis or decorators.
• Thoroughly tested live: verified both operator-to-visitor and visitor-to-operator quotes/replies in real Telegram forum topics, web widget, and webhooks. Everything works seamlessly.
• Updated default templates (doc/telegram/): added message_id_reply and reply_parameters so new imports work out of the box.

Please take a look when you have a moment. Thanks!