[_] migration(versioning): add user_id column to file_versions table #828
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This PR adds user_id column to file_versions table to enable direct user-based queries. This field will be used to calculate storage usage including version sizes and to efficiently remove all user versions when downgrading to a plan without versioning support. Since file versioning is a new feature with minimal production data, this is the ideal time to add this denormalized column for simpler and faster queries.