feat(sub): redesign the subscription page around usage, tabs and app imports

The info page was a long key/value table followed by every link and two
app dropdowns, and it rendered left-to-right even for Persian and Arabic.
It now leads with a usage ring, the remaining quota and a stats grid, and
splits the rest into Subscription / Apps / Configs tabs.

- Status tells expired, data-used-up and disabled apart instead of one
  "Inactive", replacing the hard-coded English expiry chip.
- The Apps tab keeps every Android and iOS app with its existing deep
  link, preselects the visitor's platform and adds Windows: Hiddify and
  Clash Verge Rev import directly, v2rayN copies the link.
- fa-IR and ar-EG render right-to-left; URLs, IDs and sizes stay LTR.
- The footer shows the support link and the client refresh interval, so
  subPageContext now carries subUpdates (also in ?format=info).
- Status, days-left and app deep-link logic lives in subPageModel.ts,
  with unit tests pinning the deep links the page already shipped.

frontend/src/pages/sub/app-icons/v2rayng.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 48 48" fill="none" stroke="currentColor" stroke-linecap="round" stroke-linejoin="round" stroke-width="2"><path d="m9.6185,41.4866V10.6142h-4.1185v-4.0722h10.2641v14.3936c.6957-.6404,1.2872-1.1794,1.8728-1.7248,3.5152-3.2745,7.0291-6.5504,10.5432-9.826.9416-.8777,1.8767-1.7624,2.8301-2.6271.1437-.1303.3712-.2375.5603-.2382,3.5668-.0136,10.9295,0,10.9295,0-10.9555,11.6366-21.8724,23.2736-32.8815,34.9672Z"/></svg>