From adbbb84932ca675b185ab7872201900544dbbd91 Mon Sep 17 00:00:00 2001
From: Gregor's Bot <gregor.mitschabaude+bot@gmail.com>
Date: Thu, 8 Jan 2026 11:50:44 +0100
Subject: [PATCH] fix(cron): support Telegram topic/thread ID in delivery
 target

When delivering cron job output to Telegram, the 'to' field now supports
specifying a topic (forum thread) ID in addition to the chat ID.

Supported formats:
- chatId (plain chat ID or @username)
- chatId:topicId (chat ID with numeric topic ID)
- chatId:topic:topicId (alternative format with explicit marker)

This enables cron jobs to deliver messages to specific forum topics
rather than always going to the main/general topic.

Adds parseTelegramTarget helper function with unit tests.

(cherry picked from commit 24a6595e81d6d1824b2657d714b212c587c3ee8e)