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/zh.json

@@ -3693,6 +3693,12 @@
         "dailyChart": "每日购买与收入",
         "tariffChart": "套餐分布",
         "giftBreakdown": "礼物 vs 普通",
+        "funnelTitle": "转化漏斗",
+        "giftClaimTitle": "礼物激活",
+        "giftClaimLabel": "已领取 / 已发送",
+        "dailyRevenue": "每日收入",
+        "byPaymentMethod": "按支付方式",
+        "bySource": "流量来源",
         "purchases": "购买",
         "revenueLabel": "收入",
         "gifts": "礼物",