fix: repair workspace upgrade path

[ibourgeois]

Summary

• add a repair migration for existing installs that applied the earlier workspace migration shape
• backfill legacy workspace rows into connection_workspaces
• sync the Surreal workspace sequence after backfill so new workspaces allocate the next id safely

Testing

• '/Users/ibourgeois/Library/Application Support/Herd/bin/php84' artisan test --compact tests/Feature/WorkspaceManagementTest.php

Fixes #140

[Copilot]

Pull request overview

Adds a repair migration to make upgrades from an older workspace schema safe by backfilling legacy workspaces rows into connection_workspaces and (for Surreal) syncing the id sequence so new workspace inserts don’t collide.

Changes:

• Add a repair migration that creates connection_workspaces if missing, backfills from legacy workspaces, and updates the Surreal sequence.
• Add a feature test that simulates the legacy schema and asserts the backfill populates connection_workspaces.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
database/migrations/2026_03_27_135040_repair_connection_workspaces_table.php	Creates/backfills connection_workspaces from legacy workspaces and attempts to sync Surreal sequence.
tests/Feature/WorkspaceManagementTest.php	Adds regression coverage for the legacy-to-new backfill behavior.

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