v0.1.24

Changes:

Add ActivityTagsMetadata struct with full activity metadata (id, payment_hash,
tx_id, address, is_receive, tags, created_at) for backup format
Add ActivityTags struct (activity_id, tags) for simple tag upsert operations
Implement get_all_tag_metadata() method that joins with activities and
onchain_activity tables to return full metadata
Update upsert_tags() to accept ActivityTags (simplified structure) using
INSERT OR IGNORE for additive behavior
New calls exposed:

Backup: get_all_tag_metadata() returns Vec with full
activity context.
Restore: upsert_tags() accepts Vec with just activity_id and
tags.