Add activity_id column to temporal transfers #2347
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Why:
Implements deposit workflow pattern to eliminate transfer activity
race conditions. The activity_id column tracks pending activities
created by the temporal trigger, enabling the indexer to directly
delete them using the activity_id reference instead of querying
by event_id/event_name.
Test plan:
Expected: activity_id column added with index and FK
Expected: no differences between migration and schema file
Expected: fk_transfer_activity FK to public.activity(id)