Import/Export dokploy projects

What problem will this feature address?

Currently, there is no built-in way to export a Dokploy project configuration and re-import it into another instance.
This presents a challenge for:

• Backup & recovery workflows — there's no way to version control or archive project configs.
• Migration across environments — users cannot easily replicate staging → production setups.
• Sharing reusable setups — templates and starter kits cannot be distributed without manually recreating each element.

This limits the portability, reproducibility, and collaboration potential of Dokploy-managed projects.

Describe the solution you'd like

Add functionality to:

1. Export a Dokploy project (apps, environments, secrets, volumes, domains, etc.) to a standardized portable format (e.g., JSON or YAML).
2. Import a project from such a file into any other Dokploy instance, with options for:
   • overwriting existing project with the same name,
   • skipping conflicting items,
   • dry-run/preview mode.

Describe alternatives you've considered

Just import/export as json

Additional context

No response

Will you send a PR to implement it?

No

No files, tests, or entry points are named in the issue. Start by tracing how Dokploy represents projects and their apps, environments, secrets, volumes, and domains, then review existing JSON handling before defining the portable format and conflict behavior. Done means export, import, overwrite/skip handling, and dry-run behavior are specified and covered by tests.