feat: 账号配额支持固定时间重置模式

- 后端新增 rolling/fixed 两种配额重置模式，支持日配额和周配额
- fixed 模式下可配置重置时刻（小时）、重置星期几（周配额）及时区（IANA）
- 在 account_repo.go 中使用 SQL 表达式适配两种模式的过期判断与重置时间推进
- 新增 ComputeQuotaResetAt / ValidateQuotaResetConfig 等辅助函数
- DTO 层新增相关字段并在 mappers 中完整映射
- 前端 QuotaLimitCard 新增 rolling/fixed 切换 UI、时区选择器
- CreateAccountModal / EditAccountModal 透传新配置字段
- i18n（zh/en）同步新增相关翻译词条

frontend/src/components/account/EditAccountModal.vue

@@ -967,9 +967,21 @@
           :totalLimit="editQuotaLimit"
           :dailyLimit="editQuotaDailyLimit"
           :weeklyLimit="editQuotaWeeklyLimit"
+          :dailyResetMode="editDailyResetMode"
+          :dailyResetHour="editDailyResetHour"
+          :weeklyResetMode="editWeeklyResetMode"
+          :weeklyResetDay="editWeeklyResetDay"
+          :weeklyResetHour="editWeeklyResetHour"
+          :resetTimezone="editResetTimezone"
           @update:totalLimit="editQuotaLimit = $event"
           @update:dailyLimit="editQuotaDailyLimit = $event"
           @update:weeklyLimit="editQuotaWeeklyLimit = $event"
+          @update:dailyResetMode="editDailyResetMode = $event"
+          @update:dailyResetHour="editDailyResetHour = $event"
+          @update:weeklyResetMode="editWeeklyResetMode = $event"
+          @update:weeklyResetDay="editWeeklyResetDay = $event"
+          @update:weeklyResetHour="editWeeklyResetHour = $event"
+          @update:resetTimezone="editResetTimezone = $event"
         />
       </div>
 
@@ -1608,6 +1620,12 @@ const anthropicPassthroughEnabled = ref(false)
 const editQuotaLimit = ref<number | null>(null)
 const editQuotaDailyLimit = ref<number | null>(null)
 const editQuotaWeeklyLimit = ref<number | null>(null)
+const editDailyResetMode = ref<'rolling' | 'fixed' | null>(null)
+const editDailyResetHour = ref<number | null>(null)
+const editWeeklyResetMode = ref<'rolling' | 'fixed' | null>(null)
+const editWeeklyResetDay = ref<number | null>(null)
+const editWeeklyResetHour = ref<number | null>(null)
+const editResetTimezone = ref<string | null>(null)
 const openAIWSModeOptions = computed(() => [
   { value: OPENAI_WS_MODE_OFF, label: t('admin.accounts.openai.wsModeOff') },
   // TODO: ctx_pool 选项暂时隐藏，待测试完成后恢复
@@ -1795,10 +1813,23 @@ watch(
         editQuotaDailyLimit.value = (dailyVal && dailyVal > 0) ? dailyVal : null
         const weeklyVal = extra?.quota_weekly_limit as number | undefined
         editQuotaWeeklyLimit.value = (weeklyVal && weeklyVal > 0) ? weeklyVal : null
+        // Load quota reset mode config
+        editDailyResetMode.value = (extra?.quota_daily_reset_mode as 'rolling' | 'fixed') || null
+        editDailyResetHour.value = (extra?.quota_daily_reset_hour as number) ?? null
+        editWeeklyResetMode.value = (extra?.quota_weekly_reset_mode as 'rolling' | 'fixed') || null
+        editWeeklyResetDay.value = (extra?.quota_weekly_reset_day as number) ?? null
+        editWeeklyResetHour.value = (extra?.quota_weekly_reset_hour as number) ?? null
+        editResetTimezone.value = (extra?.quota_reset_timezone as string) || null
       } else {
         editQuotaLimit.value = null
         editQuotaDailyLimit.value = null
         editQuotaWeeklyLimit.value = null
+        editDailyResetMode.value = null
+        editDailyResetHour.value = null
+        editWeeklyResetMode.value = null
+        editWeeklyResetDay.value = null
+        editWeeklyResetHour.value = null
+        editResetTimezone.value = null
       }
 
       // Load antigravity model mapping (Antigravity 只支持映射模式)
@@ -2645,6 +2676,28 @@ const handleSubmit = async () => {
       } else {
         delete newExtra.quota_weekly_limit
       }
+      // Quota reset mode config
+      if (editDailyResetMode.value === 'fixed') {
+        newExtra.quota_daily_reset_mode = 'fixed'
+        newExtra.quota_daily_reset_hour = editDailyResetHour.value ?? 0
+      } else {
+        delete newExtra.quota_daily_reset_mode
+        delete newExtra.quota_daily_reset_hour
+      }
+      if (editWeeklyResetMode.value === 'fixed') {
+        newExtra.quota_weekly_reset_mode = 'fixed'
+        newExtra.quota_weekly_reset_day = editWeeklyResetDay.value ?? 1
+        newExtra.quota_weekly_reset_hour = editWeeklyResetHour.value ?? 0
+      } else {
+        delete newExtra.quota_weekly_reset_mode
+        delete newExtra.quota_weekly_reset_day
+        delete newExtra.quota_weekly_reset_hour
+      }
+      if (editDailyResetMode.value === 'fixed' || editWeeklyResetMode.value === 'fixed') {
+        newExtra.quota_reset_timezone = editResetTimezone.value || 'UTC'
+      } else {
+        delete newExtra.quota_reset_timezone
+      }
       updatePayload.extra = newExtra
     }