API: Allow moving applications and databases between projects/environments

[NWichter-NeoTube]

Currently the API provides no way to move a resource (application or database) to a different project or environment. The UI supports this, but the API rejects these fields.

Tested on v4.0.0-beta.462

# PATCH with environment_id → "This field is not allowed."
curl -X PATCH /api/v1/applications/{uuid} -d '{ "environment_id": "..." }' 

# PATCH with project_uuid → "This field is not allowed."
curl -X PATCH /api/v1/applications/{uuid} -d '{ "project_uuid": "...", "environment_name": "production" }' 

# POST move endpoint → 404
curl -X POST /api/v1/applications/{uuid}/move -d '{ "destination_environment_uuid": "..." }' 

Use case

After project restructuring, applications need to be moved to new projects without redeployment. This is especially relevant for automated workflows that manage Coolify resources programmatically.

Proposed solution

Either:

• Accept environment_id on PATCH /api/v1/applications/{uuid}
• Or add a dedicated POST /api/v1/applications/{uuid}/move endpoint

I'd be happy to submit a PR for this.