Adds GET /panel/api/clients/list/paged that filters, sorts, and paginates
on the server, returns a slim row shape (drops uuid/password/auth/flow/
security/reverse/tgId per client), and includes a stable summary
(total, active, online[], depleted[], expiring[], deactive[]) computed
across the full DB row set so the dashboard cards don't change as the
user paginates or filters. Page size capped at 200.
useClients now exposes { clients (current page), total, filtered, query,
setQuery, summary, hydrate }. ClientsPage feeds its filter/sort/page
state into setQuery via a single effect, debounces search by 300ms, and
hydrates the full client record via /get/:email before opening edit/info/
qr modals. Local filter/sort logic and the all-clients summary memo are
gone.
On a 2000-client panel this turns the initial response from ~MB to ~25 row
slice (~10s of KB) and removes the all-client parse cost from every
refresh.