Refactor: Enable Rector Rules for Code Quality and Strictness

[n4ss1m]

This PR introduces several Rector rules to improve code quality, maintainability, and strictness. The following changes have been applied:

• Enabled deadCode, codeQuality, codingStyle, typeDeclarations rules to remove unused code, enhance readability, and enforce type declarations.
• Activated privatization and naming rules to improve encapsulation and enforce consistent naming conventions.
• Added declare(strict_types=1) to enforce strict type checking across files.
• Implemented STRICT_BOOLEANS, EARLY_RETURN, and INSTANCEOF rules for better boolean handling, optimized return flow, and improved type safety in instanceof checks.

These updates ensure better code structure, stricter type safety, and overall improved maintainability. 🚀