i18n: admin.users keys for "Reset agent usage" button

New keys across all 9 locales (en/es/fr/de/it/pt-br/ja/ru/zh-cn):
  - admin.users.actions.resetAgentUsage           — button label
  - admin.users.actions.resetAgentUsageTooltip    — hover hint
  - admin.users.confirmResetAgentUsage            — confirm dialog
  - admin.users.resetAgentUsageDone               — success toast
  - admin.users.resetAgentUsageFailed             — error toast

Consumed by the velxio-prod overlay's AdminPage Users tab, which adds
a "Reset agent" button per row that hits
POST /api/admin/users/{user_id}/reset-agent-usage and clears today's
pro_agent_usage_events for the user.  Live agent quota recomputes
from the events table, so the user can keep using the agent
immediately after the button click.

frontend/src/i18n/locales/de/common.json

@@ -224,8 +224,13 @@
       "actions": {
         "activity": "Aktivität",
         "edit": "Bearbeiten",
-        "delete": "Löschen"
-      }
+        "delete": "Löschen",
+        "resetAgentUsage": "Agent zurücksetzen",
+        "resetAgentUsageTooltip": "Tägliche Agent-Nutzung löschen, damit der Benutzer weiterhin den Agenten verwenden kann."
+      },
+      "confirmResetAgentUsage": "Agent-Kontingent für „{{username}}\" zurücksetzen (heute, UTC)?",
+      "resetAgentUsageDone": "Kontingent für {{username}} zurückgesetzt — {{cycles}} Zyklen freigegeben über {{rows}} Eintrag(e).",
+      "resetAgentUsageFailed": "Agent-Nutzung konnte nicht zurückgesetzt werden."
     },
     "boards": {
       "loadFailed": "Board-Metriken konnten nicht geladen werden.",

frontend/src/i18n/locales/en/common.json

@@ -224,8 +224,13 @@
       "actions": {
         "activity": "Activity",
         "edit": "Edit",
-        "delete": "Delete"
-      }
+        "delete": "Delete",
+        "resetAgentUsage": "Reset agent",
+        "resetAgentUsageTooltip": "Clear today's agent usage so the user can continue using the agent."
+      },
+      "confirmResetAgentUsage": "Reset agent quota for \"{{username}}\" (today, UTC)?",
+      "resetAgentUsageDone": "Reset agent quota for {{username}} — freed {{cycles}} cycle(s) across {{rows}} event row(s).",
+      "resetAgentUsageFailed": "Failed to reset agent usage."
     },
     "boards": {
       "loadFailed": "Failed to load board metrics.",

frontend/src/i18n/locales/es/common.json

@@ -224,8 +224,13 @@
       "actions": {
         "activity": "Actividad",
         "edit": "Editar",
-        "delete": "Eliminar"
-      }
+        "delete": "Eliminar",
+        "resetAgentUsage": "Reiniciar agente",
+        "resetAgentUsageTooltip": "Borra el uso de hoy del agente para que el usuario pueda seguir usándolo."
+      },
+      "confirmResetAgentUsage": "¿Reiniciar la cuota del agente para \"{{username}}\" (hoy, UTC)?",
+      "resetAgentUsageDone": "Cuota reiniciada para {{username}} — se liberaron {{cycles}} ciclo(s) en {{rows}} evento(s).",
+      "resetAgentUsageFailed": "No se pudo reiniciar el uso del agente."
     },
     "boards": {
       "loadFailed": "Error al cargar métricas de placas.",

frontend/src/i18n/locales/fr/common.json

@@ -224,8 +224,13 @@
       "actions": {
         "activity": "Activité",
         "edit": "Modifier",
-        "delete": "Supprimer"
-      }
+        "delete": "Supprimer",
+        "resetAgentUsage": "Réinitialiser l'agent",
+        "resetAgentUsageTooltip": "Effacer l'utilisation du jour pour que l'utilisateur puisse continuer."
+      },
+      "confirmResetAgentUsage": "Réinitialiser le quota de l'agent pour « {{username}} » (aujourd'hui, UTC) ?",
+      "resetAgentUsageDone": "Quota réinitialisé pour {{username}} — {{cycles}} cycle(s) libérés sur {{rows}} événement(s).",
+      "resetAgentUsageFailed": "Échec de la réinitialisation de l'utilisation de l'agent."
     },
     "boards": {
       "loadFailed": "Échec du chargement des métriques des cartes.",

frontend/src/i18n/locales/it/common.json

@@ -224,8 +224,13 @@
       "actions": {
         "activity": "Attività",
         "edit": "Modifica",
-        "delete": "Elimina"
-      }
+        "delete": "Elimina",
+        "resetAgentUsage": "Reimposta agente",
+        "resetAgentUsageTooltip": "Cancella l'utilizzo odierno dell'agente per consentire all'utente di continuare."
+      },
+      "confirmResetAgentUsage": "Reimpostare la quota dell'agente per \"{{username}}\" (oggi, UTC)?",
+      "resetAgentUsageDone": "Quota reimpostata per {{username}} — liberati {{cycles}} cicli su {{rows}} eventi.",
+      "resetAgentUsageFailed": "Impossibile reimpostare l'utilizzo dell'agente."
     },
     "boards": {
       "loadFailed": "Caricamento metriche schede fallito.",

frontend/src/i18n/locales/ja/common.json

@@ -224,8 +224,13 @@
       "actions": {
         "activity": "アクティビティ",
         "edit": "編集",
-        "delete": "削除"
-      }
+        "delete": "削除",
+        "resetAgentUsage": "エージェントをリセット",
+        "resetAgentUsageTooltip": "本日のエージェント利用量をクリアし、ユーザーが利用を継続できるようにします。"
+      },
+      "confirmResetAgentUsage": "「{{username}}」のエージェント割り当てをリセットしますか（本日、UTC）？",
+      "resetAgentUsageDone": "{{username}} の割り当てをリセットしました — {{rows}} 件のイベントで {{cycles}} サイクル分を解放しました。",
+      "resetAgentUsageFailed": "エージェントの利用量をリセットできませんでした。"
     },
     "boards": {
       "loadFailed": "ボードメトリクスの読み込みに失敗しました。",

frontend/src/i18n/locales/pt-br/common.json

@@ -224,8 +224,13 @@
       "actions": {
         "activity": "Atividade",
         "edit": "Editar",
-        "delete": "Excluir"
-      }
+        "delete": "Excluir",
+        "resetAgentUsage": "Resetar agente",
+        "resetAgentUsageTooltip": "Limpa o uso do agente de hoje para que o usuário possa continuar."
+      },
+      "confirmResetAgentUsage": "Resetar a cota do agente para \"{{username}}\" (hoje, UTC)?",
+      "resetAgentUsageDone": "Cota resetada para {{username}} — {{cycles}} ciclo(s) liberados em {{rows}} evento(s).",
+      "resetAgentUsageFailed": "Falha ao resetar o uso do agente."
     },
     "boards": {
       "loadFailed": "Falha ao carregar métricas de placas.",

frontend/src/i18n/locales/ru/common.json

@@ -224,8 +224,13 @@
       "actions": {
         "activity": "Активность",
         "edit": "Редактировать",
-        "delete": "Удалить"
-      }
+        "delete": "Удалить",
+        "resetAgentUsage": "Сбросить агента",
+        "resetAgentUsageTooltip": "Очистить дневное использование агента, чтобы пользователь мог продолжить."
+      },
+      "confirmResetAgentUsage": "Сбросить квоту агента для «{{username}}» (сегодня, UTC)?",
+      "resetAgentUsageDone": "Квота {{username}} сброшена — освобождено {{cycles}} цикл(ов) в {{rows}} событиях.",
+      "resetAgentUsageFailed": "Не удалось сбросить использование агента."
     },
     "boards": {
       "loadFailed": "Не удалось загрузить метрики плат.",

frontend/src/i18n/locales/zh-cn/common.json

@@ -224,8 +224,13 @@
       "actions": {
         "activity": "活动",
         "edit": "编辑",
-        "delete": "删除"
-      }
+        "delete": "删除",
+        "resetAgentUsage": "重置代理",
+        "resetAgentUsageTooltip": "清除今日的代理使用量，让用户可以继续使用。"
+      },
+      "confirmResetAgentUsage": "为 \"{{username}}\" 重置代理配额（今日，UTC）？",
+      "resetAgentUsageDone": "已为 {{username}} 重置配额 — 在 {{rows}} 条事件中释放了 {{cycles}} 个周期。",
+      "resetAgentUsageFailed": "无法重置代理使用量。"
     },
     "boards": {
       "loadFailed": "加载开发板指标失败。",