[Bug] remove compatible models from brick instance list endpoint

[mirkoCrobu]

Motivation

closes #114

The v1/apps/{id}/bricks response must not include compatible_models fields.

Change description

Decouple the v1/apps/{id}/bricks and v1/apps/{id}/bricks/{brick_id} response structures by creating a dedicated struct for the v1/apps/{id}/bricks endpoint.

Additional Notes

Reviewer checklist

• PR addresses a single concern.
• PR title and description are properly filled.
• Changes will be merged in main.
• Changes are covered by tests.
• Logging is meaningful in case of troubleshooting.