feat(tgbot): route admin notifications to a forum topic (#6879)

Admins who run the bot in a forum supergroup got every notification in the
General topic. An admin chat ID may now carry a topic, chatId:topicId, and the
bot's admin messages and reports go to that topic. Repeated chats collapse into
one entry and a second, different topic for the same chat is rejected, in the
panel and in the docs setup helper alike. The chat ID hint in every locale and
the English, Persian, Russian and Chinese guides describe the form.

internal/web/translation/id-ID.json

@@ -1220,7 +1220,7 @@
       "telegramAPIServer": "Server API Telegram",
       "telegramAPIServerDesc": "Server API Telegram yang akan digunakan. Biarkan kosong untuk menggunakan server default.",
       "telegramChatId": "ID Obrolan Admin",
-      "telegramChatIdDesc": "ID Obrolan Admin Telegram. (dipisahkan koma)(dapatkan di sini {'@'}userinfobot) atau (gunakan perintah '/id' di bot)",
+      "telegramChatIdDesc": "ID Obrolan Admin Telegram. (dipisahkan koma)(dapatkan di sini {'@'}userinfobot) atau (gunakan perintah '/id' di bot). Untuk mengirim ke topik forum, tambahkan ':topicId', mis. -1001234567890:42",
       "telegramNotifyTime": "Waktu Notifikasi",
       "telegramNotifyTimeDesc": "Seberapa sering bot Telegram mengirim laporan berkala. Pilih interval siap pakai, atau pilih Kustom untuk memasukkan ekspresi crontab.",
       "notifyTime": {