Add a vault for saving whole forwarded posts
Completes TODO #5. Forwarding a post now asks whether to save it whole or extract its media; sending media directly is unchanged. Built on forwarding rather than copying file_ids. The bot already has the post in its private chat with the owner, so it stores message ids and forwards them back. forwardMessages takes a list and keeps an album intact, which is what made the caption-plus-album case tractable; ids must be strictly ascending, so they are sorted on the way out. - Vault rows live in their own table and every query is scoped to an owner_id, so a guessed id cannot reach someone else's saved post. Nothing in the vault is searchable inline, moderated or federated, and the separate table makes that structural rather than a flag. - Albums arrive as separate messages with no completion signal, so they are buffered by media_group_id behind a 1s debounce and prompt once. - The add path now takes a list of items, so extracting an album stores every piece under one set of keywords instead of asking repeatedly. - /vault searches keywords and the original caption, since the point of a vault is finding something you never got round to tagging. - Retrieval failures are reported: a message id is a pointer into the chat, not a self-contained file_id, so clearing history breaks it. Three near-identical keyword collectors are now one helper. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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