Implement Docker Backups via Restic Integration

Description:
Add support for automated Docker backups in dFlow using Restic. This will allow users to create secure, incremental, and deduplicated backups of their container volumes, with storage in supported backend providers (S3, etc.).

Acceptance Criteria:

• Detect and list volumes for each Docker service in dFlow.

• Allow users to configure Restic backup settings (schedule, retention policy, storage backend).

• Run backups automatically on schedule and allow manual triggers.

• Support restore operations to the same or a different server.

• Encrypt backups with user-defined or system-generated keys.

• Log all backup and restore activities.

Benefits:

• Provides reliable and secure backups for Docker data.

• Enables quick recovery from data loss or corruption.

• Minimizes storage costs through Restic’s deduplication.