feat(typescript-zod): validate string constraints

[louis-bompart]

Description

Generate Zod string schemas with JSON Schema minLength, maxLength, and pattern constraints. Enable the corresponding TypeScript Zod fixture features and expand constraint coverage.

Related Issue

N/A

Motivation and Context

TypeScript Zod output previously discarded string length and pattern constraints, allowing invalid input through generated schemas.

Previous Behaviour / Output

z.string()

New Behaviour / Output

z.string().min(3).max(5).regex(new RegExp("^[a-z]+$"))

How Has This Been Tested?

Ran the TypeScript Zod schema fixture suite for string constraints, including valid inputs and feature-specific expected failures for combined constraints, unions/intersections, optional maximum length, escaped patterns, and maxLength: 0:

QUICKTEST=true FIXTURE=schema-typescript-zod npm run test:fixtures -- \
  test/inputs/schema/minmaxlength.schema \
  test/inputs/schema/optional-constraints.schema \
  test/inputs/schema/pattern.schema

Screenshots (if appropriate):

N/A