fix: split funding_events and slab_deletion_queue migrations

[pcfreak30]

Summary

• Split the bundled migration that combined funding_events ALTER TABLE and CREATE TABLE slab_deletion_queue into two separate migration functions
• slab_deletion_queue now matches upstream's migration index; the funding_events ALTER is a separate migration appended after

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This PR splits a combined database migration into two separate migration steps. Previously, the funding_events table alterations (adding fund_type and pool_id columns with their indexes) and the slab_deletion_queue table creation were executed together in a single migration function. They are now separated into distinct migration functions, with the slab_deletion_queue table creation running first, followed by the funding_events column and index additions. This separation ensures each schema change is applied as an individual migration step, improving migration reliability and rollback granularity.

[kody-ai]

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