feat(migration): add Location entity migration

[lynaDev2]

Summary

This PR adds the database migration required for the initial multi-location backend support.

Changes

• Added AddLocationEntity TypeORM migration.
• Creates the locations table.
• Adds a nullable locationId foreign key to the workspaces table.
• Seeds a default location for existing workspaces.
• Updates existing workspaces to reference the default location.
• Adds the necessary foreign key constraint and index.

Testing

• Generated and reviewed the migration.
• Verified the up and down methods perform the expected schema changes and rollback successfully.
  closes [BE-38] Multi-location support: backend data model #1223

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