SPACEDF-20569: [SpaceDF] - [BE] Add Bulk Device Position Update API

[ngovinh2k2]

What?

Add Bulk Device Position Update API

Why?

From the request

How?

Testing?

• Functional Testing
• Security
• Performance
• Error Handling
• Code Quality
• Documentation
• Database
• Deployment
• Final Review

Anything Else?

[df-redmine]

Linked Redmine issue: https://redmine.digitalfortress.dev/issues/20569
Branch: feat/spacedf-20569-be-add-bulk-device-position-update-api

[gemini-code-assist]

Code Review

This pull request introduces bulk update capabilities for space device positions by adding a new bulk update endpoint, view, and corresponding serializers. It also ensures orphaned position records are cleaned up when a device's position is removed. Feedback highlights key performance and correctness improvements: first, avoiding redundant nested serializer instantiation and validation in the list serializer while manually setting updated_at (since bulk_update does not trigger auto_now fields); second, eliminating double validation of the request payload in the bulk update view by using a lightweight serializer to extract IDs before performing the full validation.

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