Merge nonconformities and continual_improvements tables into a
unified findings table with kind (NONCONFORMITY, OBSERVATION,
EXCEPTION), status, and priority enums. Create findings_audits
junction table for the many-to-many audit relationship.
The migration generates new FND-XXX reference IDs per organization,
migrates both live and snapshot records preserving source_id links,
and carries over audit associations to the junction table.
Signed-off-by: Bryan Frimin <bryan@getprobo.com>
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