fix(admin-wheel): unify statistics rendering + fill config UI gaps

Statistics tab now uses the shared StatCard + BreakdownList (ranked bars +
share %) and the currency-aware formatter — matching the rest of the admin
stats instead of ad-hoc 'card p-4 text-center' / text-3xl tiles — and gains
proper loading, error and empty states.

Also surface backend-supported config the form couldn't reach (forcing DB edits):
- promo_validity_days (model + schema-bounded 1-365) is now editable in Settings.
- per-prize manual_probability override (0-1) now has an input in the prize form.

src/locales/en.json

@@ -1756,7 +1756,8 @@
         "dailyLimit": "Daily Spin Limit (0 = unlimited)",
         "minSubDays": "Min subscription days for day payment",
         "promocodes": "Promocodes",
-        "promoPrefix": "Promo code prefix"
+        "promoPrefix": "Promo code prefix",
+        "promoValidityDays": "Promo code validity (days)"
       },
       "starsNotEnabledGlobally": "Star payments are not enabled in Payment Methods. Enable \"Telegram Stars\" in the Payment Methods section.",
       "prizes": {
@@ -1783,7 +1784,9 @@
           "emoji": "Emoji",
           "color": "Color",
           "active": "Active",
-          "worth": "Worth"
+          "worth": "Worth",
+          "probability": "Manual probability (0–1)",
+          "probabilityHint": "Empty = auto by RTP"
         },
         "promo": {
           "title": "Promo Code Settings",
@@ -1801,7 +1804,9 @@
         "times": "times",
         "times_one": "{{count}} time",
         "times_other": "{{count}} times",
-        "topWins": "Top Wins"
+        "topWins": "Top Wins",
+        "loadError": "Failed to load statistics",
+        "empty": "No spins yet"
       }
     },
     "broadcasts": {

src/locales/fa.json

@@ -1432,7 +1432,8 @@
         "promoPrefix": "پیشوند کد تخفیف",
         "spinCost": "هزینه چرخش",
         "limitsAndRtp": "محدودیت‌ها و RTP",
-        "promocodes": "کدهای تخفیف"
+        "promocodes": "کدهای تخفیف",
+        "promoValidityDays": "اعتبار کد تخفیف (روز)"
       },
       "starsNotEnabledGlobally": "پرداخت با ستاره در روش‌های پرداخت فعال نیست. «Telegram Stars» را در بخش «روش‌های پرداخت» فعال کنید.",
       "prizes": {
@@ -1459,7 +1460,9 @@
           "emoji": "ایموجی",
           "color": "رنگ",
           "active": "فعال",
-          "worth": "ارزش"
+          "worth": "ارزش",
+          "probability": "احتمال دستی (۰–۱)",
+          "probabilityHint": "خالی = خودکار بر اساس RTP"
         },
         "promo": {
           "title": "تنظیمات کد تخفیف",
@@ -1476,7 +1479,9 @@
         "prizeDistribution": "توزیع جوایز",
         "times": "بار",
         "times_other": "{{count}} بار",
-        "topWins": "برترین برنده‌ها"
+        "topWins": "برترین برنده‌ها",
+        "loadError": "بارگذاری آمار ناموفق بود",
+        "empty": "هنوز چرخشی انجام نشده"
       }
     },
     "broadcasts": {

src/locales/ru.json

@@ -1782,7 +1782,8 @@
         "dailyLimit": "Дневной лимит вращений (0 = безлимит)",
         "minSubDays": "Мин. дней подписки для оплаты днями",
         "promocodes": "Промокоды",
-        "promoPrefix": "Префикс промокодов"
+        "promoPrefix": "Префикс промокодов",
+        "promoValidityDays": "Срок действия промокода (дней)"
       },
       "starsNotEnabledGlobally": "Оплата звёздами не включена в платёжных методах. Включите метод «Telegram Stars» в разделе «Платёжные методы».",
       "prizes": {
@@ -1809,7 +1810,9 @@
           "emoji": "Эмодзи",
           "color": "Цвет",
           "active": "Активен",
-          "worth": "Стоимость"
+          "worth": "Стоимость",
+          "probability": "Ручная вероятность (0–1)",
+          "probabilityHint": "Пусто — авто по RTP"
         },
         "promo": {
           "title": "Настройки промокода",
@@ -1828,7 +1831,9 @@
         "times_one": "{{count}} раз",
         "times_few": "{{count}} раза",
         "times_many": "{{count}} раз",
-        "topWins": "Топ выигрышей"
+        "topWins": "Топ выигрышей",
+        "loadError": "Не удалось загрузить статистику",
+        "empty": "Пока нет вращений"
       }
     },
     "broadcasts": {

src/locales/zh.json

@@ -1509,7 +1509,8 @@
         "promoPrefix": "优惠码前缀",
         "spinCost": "旋转费用",
         "limitsAndRtp": "限制和RTP",
-        "promocodes": "促销码"
+        "promocodes": "促销码",
+        "promoValidityDays": "促销码有效期（天）"
       },
       "starsNotEnabledGlobally": "星星支付未在支付方式中启用。请在「支付方式」中启用「Telegram Stars」。",
       "prizes": {
@@ -1536,7 +1537,9 @@
           "emoji": "表情",
           "color": "颜色",
           "active": "启用",
-          "worth": "价值"
+          "worth": "价值",
+          "probability": "手动概率 (0–1)",
+          "probabilityHint": "留空 = 按 RTP 自动"
         },
         "promo": {
           "title": "优惠码设置",
@@ -1553,7 +1556,9 @@
         "prizeDistribution": "奖品分布",
         "times": "次",
         "times_other": "{{count}} 次",
-        "topWins": "最高奖品"
+        "topWins": "最高奖品",
+        "loadError": "无法加载统计数据",
+        "empty": "暂无抽奖记录"
       }
     },
     "broadcasts": {