[Core/Component] Apply coding standards (PHPStan + PHPCS)

[bim-g]

Scope

Module: src/Core/Component

Task

• Enforce snake_case for variables and properties
• Add declare(strict_types=1);
• Apply visibility rules for traits and methods
• Ensure PHPStan passes with custom rules
• Ensure PHPCS passes with project ruleset

Expected Impact

• CI/CD passes for this module
• Consistent coding standard across the framework
• Smaller, focused PR linked to this issue