Feat: Integrate Flydrive for unified file management

[3m1n3nc3]

Background: Flydrive provides a unified API for managing files across different storage drivers (local, S3, GCS, etc.). Integrating it will give the framework consistent file handling.

Tasks:

• Add Flydrive as dependency.
• Add your implementation to the framework/filesystem package directory
• Implement FilesystemManager to configure and manage multiple storage disks.
• Add config support for local, s3, and gcs drivers out of the box.
• Add helpers for common operations: put, get, delete, exists, copy, move.
• Add tests for local driver integration.
• Document how to configure and use Flydrive.

Acceptance criteria:

• Developers can configure multiple disks (local, s3, etc.) in config.
• Interface mirrors laravel as much as possible, creating the familiar DX while also adding it own unique twists and turns.
• File operations work consistently across all drivers.
• Tests cover local disk by default.

Difficulty: medium