feat: add SFTP and FTP backup destination support using rclone

[thanhtrieunguyen]

What is this PR about?

This PR implements support for backup storage destinations beyond standard S3 by integrating SFTP and FTP providers. It extends the backend rclone sync command generator (getRclonePathAndFlags) to support dynamic, on-the-fly connection strings for FTP/SFTP configurations. In the frontend, the HandleDestinations component adapts dynamically to update form input labels, placeholders, and defaults depending on the selected provider type, ensuring a seamless user experience.

Checklist

Before submitting this PR, please make sure that:

• [✅] You created a dedicated branch based on the canary branch.
• [✅ ] You have read the suggestions in the CONTRIBUTING.md file https://github.com/Dokploy/dokploy/blob/canary/CONTRIBUTING.md#pull-request
• [✅] You have tested this PR in your local instance. If you have not tested it yet, please do so before submitting. This helps avoid wasting maintainers' time reviewing code that has not been verified by you.

Issues related

closes #416