perf(approvals): server-side pagination + pushdown filtering for listRequests #1745

Context

ApprovalService.listRequests hard-caps at limit: 500 and returns everything in one shot; the Console inbox (objectstack-ai/objectui, ApprovalsInboxPage) sorts/filters/searches client-side. The request table is append-only (every flow trigger adds a row), so a real tenant crosses 500 within weeks — at which point the "All" tab slows down and rows beyond 500 silently disappear (the dangerous half).

Scope

Server (this repo)

• limit/offset (or cursor) on listRequests + REST query params; return total
• Push the filters the client currently applies in memory down into engine queries: status, object, free-text (record title / requester / process label)
• The known obstacle: pending_approvers is a CSV string and "my pending" matching is a post-filter in memory (acknowledged in the code comments). Pagination makes that incorrect — either push it down as a LIKE-composite, or (recommended) split approvers into a join table. The migration also fixes the long-standing indexing note on sys_approval_request ("the engine does a post-filter substring match per row").

Console (objectstack-ai/objectui)

• Load-more / pager on the inbox tables; debounced server-side search
• Keep the enriched display contract (record_title, payload_display, …) — enrichment is already batched per page server-side, so cost scales with page size

Trigger

Do this before any real tenant's request table reaches a few hundred rows, or as soon as the "All" tab is perceptibly slow. Recommend bundling the approver join-table migration into the same change — one migration solves both matching performance and pagination correctness.

References

• Current implementation: listRequests in packages/plugins/plugin-approvals/src/approval-service.ts (limit 500, post-filters)
• Index caveat: sys_approval_request.object.ts indexes comment

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