Add allowed chat IDs filter to Telegram Commands

New input `allowed_chat_ids` restricts which Telegram chats can trigger
the automation. Leave empty to allow all chats (no filtering).
Useful for security-sensitive commands.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Common/Telegram Commands/README.md

@@ -25,6 +25,16 @@ Commands should start with "/" (e.g., `/status`, `/lights_on`, `/arm_alarm`). Th
 
 Each command has its own callback action that executes when received.
 
+## Access Control
+
+You can restrict which Telegram chats are allowed to trigger the automation by specifying **Allowed Chat IDs**:
+
+- Leave empty to allow commands from any chat (no filtering)
+- Add specific chat IDs to restrict access to those chats only
+- Supports user IDs (positive numbers) and group IDs (negative numbers)
+
+This is useful for security-sensitive commands like arming alarms or controlling locks.
+
 ## Author
 
 Alexei Dolgolyov (dolgolyov.alexei@gmail.com)