feat: add daily traffic & device purchase chart to addons stats

Add DualAreaChart to addons tab showing daily traffic purchases vs
device purchases with date-union merge. Add daily_devices field to
AddonsStats type and i18n keys for all 4 locales.

src/locales/en.json

@@ -1140,8 +1140,10 @@
         "revenue": "Revenue",
         "devicePurchases": "Device Purchases",
         "deviceRevenue": "Device Revenue",
+        "trafficPurchases": "Traffic",
+        "devicePurchasesDaily": "Devices",
         "byPackage": "By Package Size",
-        "dailyChart": "Daily Purchases",
+        "dailyChart": "Daily Add-on Purchases",
         "purchases": "Purchases"
       },
       "deposits": {

src/locales/fa.json

@@ -963,8 +963,10 @@
         "revenue": "درآمد",
         "devicePurchases": "خرید دستگاه",
         "deviceRevenue": "درآمد دستگاه",
+        "trafficPurchases": "ترافیک",
+        "devicePurchasesDaily": "دستگاه",
         "byPackage": "بر اساس بسته",
-        "dailyChart": "خرید روزانه",
+        "dailyChart": "خرید روزانه خدمات اضافی",
         "purchases": "خرید"
       },
       "deposits": {

src/locales/ru.json

@@ -1161,8 +1161,10 @@
         "revenue": "Доход",
         "devicePurchases": "Покупки устройств",
         "deviceRevenue": "Доход от устройств",
+        "trafficPurchases": "Трафик",
+        "devicePurchasesDaily": "Устройства",
         "byPackage": "По размеру пакета",
-        "dailyChart": "Покупки по дням",
+        "dailyChart": "Покупки доп. услуг по дням",
         "purchases": "Покупки"
       },
       "deposits": {

src/locales/zh.json

@@ -963,8 +963,10 @@
         "revenue": "收入",
         "devicePurchases": "设备购买",
         "deviceRevenue": "设备收入",
+        "trafficPurchases": "流量",
+        "devicePurchasesDaily": "设备",
         "byPackage": "按套餐大小",
-        "dailyChart": "每日购买",
+        "dailyChart": "每日附加服务购买",
         "purchases": "购买"
       },
       "deposits": {