feat(landing-stats): rebuild charts on shared components + add funnel & breakdowns

The landing stats page rendered raw recharts by hand plus a bespoke progress-bar
list, looking nothing like the Sales/Remnawave stats. Rebuild it on the shared
chart components and add the visualizations the data warrants:

- Daily: MultiSeriesAreaChart (created/paid) + SimpleAreaChart (revenue),
  replacing the hand-rolled area chart and the custom progress-bar list.
- Tariff & traffic sources: BreakdownList; payment methods & gift composition:
  DonutChart — all the same components Sales stats uses.
- New conversion Funnel (created → paid) and a Gift activation card
  (claimed/sent + rate), backed by the new backend breakdowns.
- Containers use the bento-card surface; i18n added in ru/en/zh/fa.

src/locales/fa.json

@@ -3694,6 +3694,12 @@
         "dailyChart": "خرید و درآمد روزانه",
         "tariffChart": "توزیع طرح‌ها",
         "giftBreakdown": "هدایا در مقابل عادی",
+        "funnelTitle": "قیف تبدیل",
+        "giftClaimTitle": "فعال‌سازی هدیه",
+        "giftClaimLabel": "دریافت‌شده / ارسال‌شده",
+        "dailyRevenue": "درآمد روزانه",
+        "byPaymentMethod": "بر اساس روش پرداخت",
+        "bySource": "منابع ترافیک",
         "purchases": "خریدها",
         "revenueLabel": "درآمد",
         "gifts": "هدایا",