feat(clients,routing): label inbounds by remark with tag fallback

Inbound pickers and chips across the Users area, the inbounds attach-clients modals, and the routing rule inbound-tags selector showed the auto-generated tag (in-443-tcp). Show the inbound remark when set, falling back to the tag.

Only display labels change; option values keep using the inbound id (or tag for routing rules, which match inbounds by tag), so filtering, attaching, and saved rules are unaffected. Routing reads remarks via a shared useInboundOptions hook that reuses the existing options query cache.

frontend/src/pages/clients/ClientInfoModal.tsx

@@ -382,7 +382,7 @@ export default function ClientInfoModal({
                         const ib = inboundsById[id];
                         const proto = (ib?.protocol || '').toLowerCase();
                         const color = INBOUND_PROTOCOL_COLORS[proto] ?? 'default';
-                        const label = ib?.tag ?? '';
+                        const label = ib?.remark?.trim() || ib?.tag || '';
                         return (
                           <Tooltip key={id} title={label}>
                             <Tag color={color}>{label}</Tag>