fix(admin): 修复使用记录页面趋势图筛选联动和日期选择问题

修复两个问题：
   1. Token使用趋势图和模型分布图未响应筛选条件
   2. 上午时段选择今天刷新后日期回退到前一天

   前端修改：
   - 更新 dashboard API 类型定义，添加 model、account_id、group_id、stream 参数支持
   - 修改 UsageView 趋势图加载逻辑，传递所有筛选参数到后端
   - 修复日期格式化函数，使用本地时区避免 UTC 转换导致的日期偏移

   后端修改：
   - Handler 层：接收并解析所有筛选参数（model、account_id、group_id、stream）
   - Service 层：传递完整的筛选参数到 Repository 层
   - Repository 层：SQL 查询动态添加所有过滤条件
   - 更新接口定义和所有调用点以保持一致性

   影响范围：
   - /admin/dashboard/trend 端点现支持完整筛选
   - /admin/dashboard/models 端点现支持完整筛选
   - 用户在后台使用记录页面选择任意筛选条件时，趋势图和模型分布图会实时响应
   - 日期选择器在任何时区下都能正确保持今天的选择

frontend/src/api/admin/dashboard.ts

@@ -46,6 +46,10 @@ export interface TrendParams {
   granularity?: 'day' | 'hour'
   user_id?: number
   api_key_id?: number
+  model?: string
+  account_id?: number
+  group_id?: number
+  stream?: boolean
 }
 
 export interface TrendResponse {
@@ -70,6 +74,10 @@ export interface ModelStatsParams {
   end_date?: string
   user_id?: number
   api_key_id?: number
+  model?: string
+  account_id?: number
+  group_id?: number
+  stream?: boolean
 }
 
 export interface ModelStatsResponse {

frontend/src/views/admin/UsageView.vue

@@ -44,8 +44,14 @@ let abortController: AbortController | null = null; let exportAbortController: A
 const exportProgress = reactive({ show: false, progress: 0, current: 0, total: 0, estimatedTime: '' })
 
 const granularityOptions = computed(() => [{ value: 'day', label: t('admin.dashboard.day') }, { value: 'hour', label: t('admin.dashboard.hour') }])
-const formatLD = (d: Date) => d.toISOString().split('T')[0]
-const now = new Date(); const weekAgo = new Date(Date.now() - 6 * 86400000)
+// Use local timezone to avoid UTC timezone issues
+const formatLD = (d: Date) => {
+  const year = d.getFullYear()
+  const month = String(d.getMonth() + 1).padStart(2, '0')
+  const day = String(d.getDate()).padStart(2, '0')
+  return `${year}-${month}-${day}`
+}
+const now = new Date(); const weekAgo = new Date(); weekAgo.setDate(weekAgo.getDate() - 6)
 const startDate = ref(formatLD(weekAgo)); const endDate = ref(formatLD(now))
 const filters = ref<AdminUsageQueryParams>({ user_id: undefined, model: undefined, group_id: undefined, start_date: startDate.value, end_date: endDate.value })
 const pagination = reactive({ page: 1, page_size: 20, total: 0 })
@@ -61,8 +67,8 @@ const loadStats = async () => { try { const s = await adminAPI.usage.getStats(fi
 const loadChartData = async () => {
   chartsLoading.value = true
   try {
-    const params = { start_date: filters.value.start_date || startDate.value, end_date: filters.value.end_date || endDate.value, granularity: granularity.value, user_id: filters.value.user_id }
-    const [trendRes, modelRes] = await Promise.all([adminAPI.dashboard.getUsageTrend(params), adminAPI.dashboard.getModelStats({ start_date: params.start_date, end_date: params.end_date, user_id: params.user_id })])
+    const params = { start_date: filters.value.start_date || startDate.value, end_date: filters.value.end_date || endDate.value, granularity: granularity.value, user_id: filters.value.user_id, model: filters.value.model, api_key_id: filters.value.api_key_id, account_id: filters.value.account_id, group_id: filters.value.group_id, stream: filters.value.stream }
+    const [trendRes, modelRes] = await Promise.all([adminAPI.dashboard.getUsageTrend(params), adminAPI.dashboard.getModelStats({ start_date: params.start_date, end_date: params.end_date, user_id: params.user_id, model: params.model, api_key_id: params.api_key_id, account_id: params.account_id, group_id: params.group_id, stream: params.stream })])
     trendData.value = trendRes.trend || []; modelStats.value = modelRes.models || []
   } catch (error) { console.error('Failed to load chart data:', error) } finally { chartsLoading.value = false }
 }