List and query resource quotas in the active scope

Returns the per-resource quota rows for the active scope as rendered by the Quotas page on route load: the metered resource (vCPUs, Memory, Floating IPs, Block storage, ...), its category and unit, the current limit, current usage, and — when a limit increase has been filed — the requested value and the request status (REQUESTED, APPROVED, AUTO_APPROVED, REJECTED; both null when no request exists). This single endpoint also serves the search/filter/sort/paginate behavior (billing.quota.search_filter_sort): the UI's category selector maps to the category query parameter, the "Filter resources…" box maps to q (matched against the resource name), and status narrows to rows with a matching request status; sort, order, page and pageSize apply standard collection semantics. Validation: scopeId must reference a scope the caller can access (otherwise 403 FORBIDDEN); status must be one of REQUESTED|APPROVED|AUTO_APPROVED|REJECTED (otherwise 422 VALIDATION_FAILED); unknown sort keys map to 422 VALIDATION_FAILED. Async & state: Synchronous read; no state change. No SSE frames are emitted. Errors: 401 when unauthenticated; 403 when the caller lacks read access to the scope; 422 for malformed query parameters; 500 on backend read-model failure. Idempotency/Concurrency: Safe, cacheable; no idempotency key required.