feat(input_schema): Support default, prefill and example in sub-properties

[mfori]

This PR:

• Adds support for specifying default, prefill and example for sub-properties in input schema.

  • change in apify-core is required to make it load the values, PR ready here: https://github.com/apify/apify-core/pull/23714
  • parent property has priority over child property (but this is solved in the apify-core) example:

  {
   "object": {
    "default": { "key1": "fromParent" },
    "properties": {
     "key1": {
       "default": "fromChild"
     }
    }
   }
  }
  

  Default would be: { "object": { "key1": "fromParent" } }

• Adds support for specifying validation keywords under items property, like:

  {
   title: 'Field title',
   description: 'My test field',
   type: 'array',
   editor: 'schemaBased',
    items: {
     type: 'string',
     pattern: '^\\d+$',
     minLength: 2,
     maxLength: 4
   }
  }
  

  This is handled automatically by Ajv.

[Copilot]

Pull Request Overview

Adds support for default, prefill, and example on nested (sub-)properties in the input schema and extends array item validation to honor per-item constraints (pattern, min/max length, numeric bounds, etc.).

• Introduces prefill/example/default keywords across sub-schema definitions (string, enum, number, integer, boolean, object, resource, arrays) with nullable-aware default typing.
• Enhances array items schema to allow validation keywords for primitive item types (string/integer/number/boolean) and updates tests to cover string item validation.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
test/utilities.client.test.ts	Adds test ensuring array item constraints (pattern, min/max length, type) are validated.
test/input_schema.test.ts	Extends test schema to include nested defaults/prefills/examples for object and array sub-properties.
packages/json_schemas/schemas/input.schema.json	Adds prefill/example/default handling with nullable logic; replaces additionalProperties with unevaluatedProperties; extends array items schema to support validation keywords for primitive types.

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[valekjo]

Looks good. The schema is growing more than Apify :D

[valekjo]

Question: This is unrelated fix to allow floats, right?

[mfori]

Yes, I forgot to add it here when adding float support