Fix workspace deletion from settings

[zajca]

Summary

• Route Settings workspace deletion through the non-office workspace endpoint so it works when features.office=false.
• Cascade workspace deletion through workspace-owned tasks and workflows before deleting the workspace row.
• Add regression coverage for deleting a workspace with task/workflow data.

Root Cause

The Settings delete action called /api/v1/office/workspaces/:id, but production disables Office routes. The legacy /api/v1/workspaces/:id path only deleted the workspace row and did not clean up workspace-owned task/workflow data first.

Verification

• go test ./internal/task/service -count=1
• pnpm --filter @kandev/web test -- app/actions/workspaces.test.ts
• pnpm --filter @kandev/web typecheck

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[carlosflorencio]

Thanks! approved the ci in both PRs to run