Fix: Support for exclusiveMinimum and exclusiveMaximum in Zod schema generation

Fixes #2182

Problem

Currently, Orval's Zod client generates only basic primitives (z.number(), z.string(), etc.) and does not translate JSON Schema numeric constraints (minimum, exclusiveMinimum, maximum, exclusiveMaximum) into Zod refinements. This means numeric constraints declared in OpenAPI definitions are lost in the generated schemas, creating gaps between backend validation (e.g., Pydantic's gt=0) and frontend validation in libraries like React Hook Form.

Example:
Given an OpenAPI schema with exclusiveMinimum: 0, the current implementation generates:

export const BaseBidSchema = z.object({
  price: z.number(), // Missing .gt(0) constraint
});

Instead of:

export const BaseBidSchema = z.object({
  price: z.number().gt(0), // Correct exclusive constraint
});

Solution

Added support for both OpenAPI 3.0 and 3.1 formats:

• OpenAPI 3.0: exclusiveMinimum and exclusiveMaximum are boolean flags indicating whether minimum/maximum should be exclusive
• OpenAPI 3.1: exclusiveMinimum and exclusiveMaximum are numeric values themselves

The implementation automatically detects the format and generates the appropriate Zod constraints:

• minimum: n → .min(n) (inclusive)
• exclusiveMinimum: n or exclusiveMinimum: true → .gt(n) (exclusive)
• maximum: n → .max(n) (inclusive)
• exclusiveMaximum: n or exclusiveMaximum: true → .lt(n) (exclusive)

Changes

1. Enhanced field extraction in generateZodValidationSchemaDefinition():

   • Extract exclusiveMinimum and exclusiveMaximum from schema
   • Handle both boolean (OpenAPI 3.0) and numeric (OpenAPI 3.1) formats
   • Convert boolean flags to numeric values when needed

2. Updated constraint generation logic:

   • When exclusive minimum/maximum are present, generate .gt() and .lt() instead of .min() and .max()
   • Added comprehensive inline comments explaining the logic

3. Comprehensive test coverage:

   • Created 6 new tests organized in two groups:
     • OpenAPI 3.1 format tests (numeric exclusiveMinimum/exclusiveMaximum)
     • OpenAPI 3.0 format tests (boolean exclusiveMinimum/exclusiveMaximum)
   • Each group covers: single exclusiveMinimum, single exclusiveMaximum, and both combined