feat(hosts): add drag-and-drop and global subscription ordering (#6895)

Hosts already had one saved order on the Hosts page, but subscriptions honoured
it only inside each inbound, so a host of a later inbound could never come before
one of an earlier inbound (#6894). A new opt-in setting makes raw/base64,
Clash/Mihomo and JSON subscriptions follow the Hosts page order across inbounds;
the default keeps today's inbound-first output unchanged. The Hosts table gains
drag-and-drop reordering next to the Up/Down buttons, on a pointer-reorder hook
the Routing Rules table now shares.

frontend/src/api/queries/useHostMutations.ts

@@ -45,7 +45,7 @@ export function useHostMutations() {
     mutationFn: (groupIds: string[]) =>
       HttpUtil.post('/panel/api/hosts/reorder', { ids: groupIds }, JSON_HEADERS),
     onSuccess: (msg) => {
-      if (msg?.success) invalidate();
+      if (msg?.success) return invalidate();
     },
   });