When a Telegram message originates from a forum topic, the thread_id was
extracted and used for reply routing but never stored in ChannelMessage.thread_ts.
This caused all messages from the same sender to share conversation history
regardless of which topic they were posted in.
Changes:
- Set thread_ts to the extracted thread_id in parse_update_message,
try_parse_voice_message, and try_parse_attachment_message
- Use 'ref' in if-let patterns to avoid moving thread_id before it's assigned
- Update conversation_history_key() to include thread_ts when present,
producing keys like 'telegram_<thread_id>_<sender>' for forum topics
- Update conversation_memory_key() to also include thread_ts for memory isolation
This enables proper per-topic session isolation in Telegram forum groups while
preserving existing behavior for regular groups and DMs (where thread_ts is None).
Closes#1532
Preventnetworkhacking
82c7fe8d8b