Bug Description

When a new user sends a message in a Telegram forum topic (supergroup with topics enabled), the pairing auto-reply is sent to the General channel instead of the original topic.

Steps to Reproduce

1. Configure a Telegram group with topics in channels.telegram.groups with requireMention: false
2. Have dmPolicy: "pairing" enabled
3. A new (not yet approved) user sends a message in a specific topic (e.g., topic:515)
4. The pairing request auto-reply goes to General instead of topic:515

Expected Behavior

Pairing auto-reply should preserve message_thread_id and reply in the same topic where the original message was sent.

Actual Behavior

Auto-reply is sent to the General channel (root of the forum group), losing topic context.

Logs

telegram pairing request: asybereg (Asya Berezhnova) chatId:115683690
Approved telegram sender 115683690

Reply appeared in General, not in the topic where the user wrote.

Environment

• OpenClaw version: 2026.2.1
• Telegram group type: Supergroup with forum topics enabled
• Config: groupPolicy: "allowlist", dmPolicy: "pairing"

Suggested Fix

Preserve message_thread_id from the incoming message context when sending pairing-related auto-replies in forum groups.