- zod-utils.ts: optionalRegex/optionalEmail/optionalText with preprocess('' -> null)
- clients/organizations/services schemas now accept empty strings for optional fields
(controlled inputs naturally produce '' instead of null)
- ApiError.prettyMessage() unfolds zod fieldErrors so users see which field failed
Reproduce: POST /api/clients with email="" or empty inn returned 400 validation_error.
Now it succeeds (empty stays null), and any real validation error names the field.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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