feat(validator): add all constrait validator

[imdhemy]

Q	A
License	GPLv3
Issue	Closes #171

This PR:

• Adds all constraint.
• Extends the flatten-violation helper to support nested violation flattening and formating.

[Copilot]

Pull request overview

Adds a new built-in all constraint to apply nested validation rules to each element of an array, and updates violation flattening so nested/indexed violation paths can be represented in a dot-notation style for easier client consumption (e.g., form error mapping).

Changes:

• Introduces all constraint (with unit + integration tests) and registers/exports it via the constraints public API.
• Updates createValidator nested-rule plumbing to preserve the “current value” explicitly when descending into nested validations.
• Extends flattenViolations to format bracketed/indexed paths (e.g. matrix[1][0]) into dot notation (matrix.1.0) and adds tests.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/validator/flatten-violations.ts	Formats violation paths before grouping/flattening.
src/validator/flatten-violations.test.ts	Adds coverage for bracket/index path formatting cases.
src/validator/factory/create-validator.ts	Adjusts nested validation value passing to preserve explicit undefined values.
src/validator/constraints/other/all.ts	Adds the new all constraint implementation.
src/validator/constraints/other/all.test.ts	Unit tests for all constraint behavior.
src/validator/constraints/other/all.integration.test.ts	End-to-end validation tests for all in real schemas/groups/composition.
src/validator/constraints/index.ts	Registers all in builtInConstraints and exports it from the public constraints API.