feat(BA-3209): Add artifact_storages common table

[jopemachine]

resolves #7040 (BA-3209)

Checklist: (if applicable)

• Mention to the original issue

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📚 Documentation preview 📚: https://sorna--7057.org.readthedocs.build/en/7057/

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📚 Documentation preview 📚: https://sorna-ko--7057.org.readthedocs.build/ko/7057/

[Copilot]

Pull request overview

This PR introduces a new artifact_storages common table to centralize storage metadata management across object storage and VFS storage backends. The change refactors the storage architecture by extracting the name column from both object_storages and vfs_storages tables into a shared artifact_storages table.

Key changes:

• Added new ArtifactStorageRow model to store common metadata (name, storage_id, type) for all storage backends
• Migrated existing storage names to the new artifact_storages table via Alembic migration
• Updated repository queries to use eager loading (selectinload) for the new meta relationship

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/ai/backend/manager/models/artifact_storages.py	Introduces new ArtifactStorageRow model with bidirectional relationships to object and VFS storage tables
src/ai/backend/manager/models/alembic/versions/35dfab3b0662_add_artifact_storages_common_table.py	Alembic migration that creates artifact_storages table and migrates existing data from both storage types
src/ai/backend/manager/models/vfs_storage.py	Removes name column, adds meta relationship, updates to_dataclass() to retrieve name from relationship
src/ai/backend/manager/models/object_storage.py	Removes name column, adds meta relationship, updates to_dataclass() to retrieve name from relationship
src/ai/backend/manager/repositories/vfs_storage/db_source/db_source.py	Adds eager loading of meta relationship in all query methods to prevent N+1 queries
src/ai/backend/manager/repositories/object_storage/db_source/db_source.py	Adds eager loading of meta relationship in all query methods to prevent N+1 queries
src/ai/backend/manager/models/__init__.py	Registers the new artifact_storages module in the models package
changes/7057.feature.md	Changelog entry describing the new feature

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