Migrate to Gradle version catalog (libs.versions.toml)

## Description
Migrate dependency management to Gradle version catalog for better maintainability.

## Deliverables
- Create `gradle/libs.versions.toml` file
- Migrate all dependencies from build.gradle.kts files
- Update documentation

## Benefits
- Centralized version management
- Type-safe dependency accessors
- Better IDE support
- Easier dependency updates