fix(sub): {{INBOUND}} = inbound remark, fix {{TRAFFIC_LEFT}} across inbounds (#5443)

Issue 1: the host endpoint remark no longer substitutes the inbound remark
as the config name. {{INBOUND}} always resolves to the inbound's own remark
and {{HOST}} to the host remark, so both can be shown side by side instead
of the host name appearing twice. configName() drops hostRemark entirely;
token help text updated in all locales.

Issue 2: client_traffics.email is globally unique, so a client shared across
several inbounds of one subscription has a single traffic row owned by one
inbound. statsForClient only searched the current inbound's preloaded
ClientStats, missing on every other inbound's link and falling back to
Up=Down=0 -- so {{TRAFFIC_LEFT}} printed the full quota. Build a per-request
email->stats map from all the subscription's inbounds (no extra queries) and
fall back to it.

internal/web/translation/ar-EG.json

@@ -1761,7 +1761,7 @@
           "time": "الوقت والحالة"
         },
         "descEMAIL": "بريد العميل",
-        "descINBOUND": "اسم الإعداد: ملاحظة المضيف عند تعيينها، وإلا ملاحظة الوارد",
+        "descINBOUND": "ملاحظة الوارد نفسه (اسم الإعداد)",
         "descHOST": "ملاحظة المضيف",
         "descID": "UUID العميل",
         "descSHORT_ID": "أول 8 أحرف من الـ UUID",

internal/web/translation/en-US.json

@@ -951,7 +951,7 @@
           "time": "Time & status"
         },
         "descEMAIL": "Client email",
-        "descINBOUND": "Config name: the host's remark when set, otherwise the inbound's remark",
+        "descINBOUND": "Inbound's own remark (the config name)",
         "descHOST": "Host remark",
         "descID": "Client UUID",
         "descSHORT_ID": "First 8 characters of the UUID",

internal/web/translation/es-ES.json

@@ -1761,7 +1761,7 @@
           "time": "Tiempo y estado"
         },
         "descEMAIL": "Email del cliente",
-        "descINBOUND": "Nombre de la configuración: las notas del host cuando están definidas, de lo contrario las notas del inbound",
+        "descINBOUND": "Notas del propio inbound (nombre de la configuración)",
         "descHOST": "Notas del host",
         "descID": "UUID del cliente",
         "descSHORT_ID": "Primeros 8 caracteres del UUID",

internal/web/translation/fa-IR.json

@@ -1761,7 +1761,7 @@
           "time": "زمان و وضعیت"
         },
         "descEMAIL": "ایمیل کاربر",
-        "descINBOUND": "نام کانفیگ: نام میزبان در صورت تنظیم، در غیر این صورت نام اینباند",
+        "descINBOUND": "نام خود اینباند (نام کانفیگ)",
         "descHOST": "نام میزبان",
         "descID": "UUID کاربر",
         "descSHORT_ID": "۸ کاراکتر اول UUID",

internal/web/translation/id-ID.json

@@ -1761,7 +1761,7 @@
           "time": "Waktu & status"
         },
         "descEMAIL": "Email klien",
-        "descINBOUND": "Nama konfigurasi: catatan host bila diatur, jika tidak catatan inbound",
+        "descINBOUND": "Catatan inbound itu sendiri (nama konfigurasi)",
         "descHOST": "Catatan host",
         "descID": "UUID klien",
         "descSHORT_ID": "8 karakter pertama dari UUID",

internal/web/translation/ja-JP.json

@@ -1761,7 +1761,7 @@
           "time": "時刻とステータス"
         },
         "descEMAIL": "クライアントのメール",
-        "descINBOUND": "設定名: ホストの備考が設定されている場合はそれ、それ以外はインバウンドの備考",
+        "descINBOUND": "インバウンド自身の備考（設定名）",
         "descHOST": "ホストの備考",
         "descID": "クライアント UUID",
         "descSHORT_ID": "UUID の最初の 8 文字",

internal/web/translation/pt-BR.json

@@ -1761,7 +1761,7 @@
           "time": "Tempo e status"
         },
         "descEMAIL": "Email do cliente",
-        "descINBOUND": "Nome da configuração: a observação do host quando definida, caso contrário a observação da entrada",
+        "descINBOUND": "Observação da própria entrada (nome da configuração)",
         "descHOST": "Observação do host",
         "descID": "UUID do cliente",
         "descSHORT_ID": "Primeiros 8 caracteres do UUID",

internal/web/translation/ru-RU.json

@@ -1761,7 +1761,7 @@
           "time": "Время и статус"
         },
         "descEMAIL": "Email клиента",
-        "descINBOUND": "Имя конфигурации: примечание хоста, если задано, иначе примечание входящего",
+        "descINBOUND": "Собственное примечание входящего (имя конфигурации)",
         "descHOST": "Примечание хоста",
         "descID": "UUID клиента",
         "descSHORT_ID": "Первые 8 символов UUID",

internal/web/translation/tr-TR.json

@@ -1761,7 +1761,7 @@
           "time": "Zaman ve durum"
         },
         "descEMAIL": "Kullanıcı e-postası",
-        "descINBOUND": "Yapılandırma adı: ayarlanmışsa host'un açıklaması, aksi halde gelen bağlantının açıklaması",
+        "descINBOUND": "Gelen bağlantının kendi açıklaması (yapılandırma adı)",
         "descHOST": "Host açıklaması",
         "descID": "Kullanıcı UUID'si",
         "descSHORT_ID": "UUID'nin ilk 8 karakteri",

internal/web/translation/uk-UA.json

@@ -1761,7 +1761,7 @@
           "time": "Час і статус"
         },
         "descEMAIL": "Email клієнта",
-        "descINBOUND": "Назва конфігурації: примітка хоста, якщо задана, інакше примітка вхідного",
+        "descINBOUND": "Власна примітка вхідного (назва конфігурації)",
         "descHOST": "Примітка хоста",
         "descID": "UUID клієнта",
         "descSHORT_ID": "Перші 8 символів UUID",

internal/web/translation/vi-VN.json

@@ -1761,7 +1761,7 @@
           "time": "Thời gian & trạng thái"
         },
         "descEMAIL": "Email khách hàng",
-        "descINBOUND": "Tên cấu hình: ghi chú của host nếu được đặt, nếu không thì ghi chú của inbound",
+        "descINBOUND": "Ghi chú của chính inbound (tên cấu hình)",
         "descHOST": "Ghi chú host",
         "descID": "UUID khách hàng",
         "descSHORT_ID": "8 ký tự đầu của UUID",

internal/web/translation/zh-CN.json

@@ -1761,7 +1761,7 @@
           "time": "时间与状态"
         },
         "descEMAIL": "客户端邮箱",
-        "descINBOUND": "配置名称：已设置时为主机的备注，否则为入站的备注",
+        "descINBOUND": "入站本身的备注（配置名称）",
         "descHOST": "主机备注",
         "descID": "客户端 UUID",
         "descSHORT_ID": "UUID 的前 8 个字符",

internal/web/translation/zh-TW.json

@@ -1761,7 +1761,7 @@
           "time": "時間與狀態"
         },
         "descEMAIL": "客戶端電子郵件",
-        "descINBOUND": "配置名稱：設定時為 Host 的備註，否則為入站的備註",
+        "descINBOUND": "入站本身的備註（配置名稱）",
         "descHOST": "Host 備註",
         "descID": "客戶端 UUID",
         "descSHORT_ID": "UUID 的前 8 個字元",