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refactor(attachments): use DRF-compliant error format for field-specific validation (#5829)

### 📣 Summary
Standardizes error responses to return a list of field-specific
validation errors using DRF format.


### 📖 Description
This PR refactors the bulk deletion attachment validation logic to
comply with Django REST Framework’s error response format.

Instead of returning a generic error or a flat structure, the API now
returns a dictionary where each field maps to a list of corresponding
error messages.

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