fix(openworkflow): only transform PG column names, not JSON value object keys

[jamescmartinez]

Closes #367

See test or original GH issue for details.

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commit: e8ce862

[Copilot]

Pull request overview

Fixes a Postgres backend bug where enabling postgres.toCamel globally was also mutating keys inside JSONB payloads (e.g., workflow run input), ensuring user-provided JSON keys are preserved exactly as provided.

Changes:

• Scope Postgres.js transform to apply only to result column names (not JSON value object keys).
• Add a regression test that verifies uppercase snake_case JSON keys survive create + readback (API and raw DB query).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/openworkflow/postgres/postgres.ts	Updates Postgres client creation to transform only column names via transform.column.from.
packages/openworkflow/postgres/backend.test.ts	Adds regression coverage for JSON key preservation in workflow run input, both via backend API and direct SQL read.

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