feat: remove validators

[loks0n]

Summary by CodeRabbit

Release Notes

• Refactor

  • Migrated validation framework to external package dependency for improved maintainability and consistency.
  • Updated validation logic to apply checks to all parameter values, including optional null values, altering validation error handling behavior.

• Chores

  • Updated Docker and deployment configurations with service port and volume mappings.

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Walkthrough

This pull request executes a migration from a local validator framework to an external dependency. The abstract Validator base class and approximately 20 concrete validator implementations (Boolean, Integer, Text, URL, Domain, etc.) are deleted from the src/Validator/ directory. A new external dependency utopia-php/validators version 0.1.* is added to composer.json. Additionally, validation logic in src/App.php is modified to process null values for optional parameters instead of returning early, and Docker configuration is updated to remove the TESTING build argument and add port/volume mappings to the web service.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~50 minutes

• Validator replacement strategy: Verify that the external utopia-php/validators library provides equivalent functionality to the 20+ deleted local validator classes, and check for API compatibility differences
• App.php logic change: The removal of the early return for optional parameters with null values fundamentally alters validation behavior; requires understanding the new validation flow and its implications for error handling
• Code dependency audit: Scan the broader codebase for any remaining references to the deleted validator classes to ensure no broken imports or instantiations exist
• Docker configuration impact: Confirm that removing the TESTING variable and adding port/volume mappings don't break the build or runtime behavior
• Integration verification: Determine whether additional code changes are required elsewhere to adapt to the external validator library's API

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title accurately and directly describes the main change: removing multiple validator classes and the abstract Validator contract from the codebase.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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