chore(objectstack): upgrade to 7.6.0 + adopt client.approvals (resume flow); drop dead workflow code

[xuyushun441-sys]

Summary

Bump all @objectstack/* 7.5.0 → 7.6.0 (mobile + apps/server).

7.6 removed the dead workflow approval API from the client SDK (client.workflow.approve/reject + Workflow*Response types) and shipped the proper client.approvals namespace (framework #1515). Adapt the app:

• Rewire useApprovals to client.approvals.{listRequests, getRequest, approve, reject}. Approve/reject now go through POST /api/v1/approvals/requests/:id/{approve,reject} → the service's decide(), which resumes the owning flow run (ADR-0019) and enforces approver authorization — instead of the old data.update(status) workaround that bypassed both. (Closes the workaround flagged in feat(approvals): review screen + cleaner inbox (no raw record id) #74.)
• Delete the dead workflow cluster — useAutomation, useWorkflowState, WorkflowStatePanel + their tests (unused; superseded by StateMachineViewer / useApprovals / useFlowRuns; broken by the 7.6 client removal). Drop the useAutomation barrel export.

Verification (in-browser, local 7.6 server)

• ✅ tsc --noEmit clean (mobile + server); objectstack validate passes; full jest suite green (1164).
• ✅ Approvals inbox loads via GET /api/v1/approvals/requests (not data.find).
• ✅ Approve hits POST /api/v1/approvals/requests/:id/approve (the canonical decide endpoint, not a data PATCH).
• ✅ Server enforces authorization: a non-approver gets 403 FORBIDDEN ("actor is not a pending approver") — surfaced to the user as an error toast. The old data.update path silently allowed it.

Notes

• The successful-approve + flow-resume happy path requires a flow-opened request with a resolved approver (pending_approvers is server-managed), which isn't fabricable locally with the bundled draft flows — but the endpoint + authorization path is verified.
• workflow is still advertised as unavailable in discovery on 7.6 (the workflow CoreServiceName cleanup from #1515 hasn't shipped); harmless, no client refs remain.

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