fix: add missing import for select and DatasetFiles in replace endpoint

[JasonW404]

Summary

Fix missing import in the newly added PUT /{file_id}/replace endpoint.

Problem

The endpoint was missing the required imports:

• from sqlalchemy.future import select
• from app.db.models import DatasetFiles

This caused a NameError: name 'select' is not defined when calling the API.

Solution

Added the missing imports inside the endpoint function, following the same pattern as the existing update_file_tags endpoint.

[Copilot]

Pull request overview

Fixes a runtime NameError in the annotation task API by adding the missing SQLAlchemy/model imports used by the PUT /task/{file_id}/replace endpoint, aligning it with the existing update_file_tags implementation pattern.

Changes:

• Add select import inside replace_file_tags to support the query execution.
• Add DatasetFiles import inside replace_file_tags to resolve the referenced ORM model.

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