refactor: 优化仪表盘权限和 UI 样式

- 普通用户仪表盘隐藏提供商统计相关信息
- 为普通用户新增每日使用趋势折线图
- 登录对话框 UI 样式优化（Logo 放大、圆角统一）
- 输入框组件样式微调
- 将项目名称从 "API Gateway" 改为 "AI Gateway"

frontend/src/views/public/Home.vue

@@ -37,7 +37,7 @@
               <h1 class="text-lg font-bold text-[#191919] dark:text-white leading-none">
                 Aether
               </h1>
-              <span class="text-[10px] text-[#91918d] dark:text-muted-foreground leading-none mt-1.5 font-medium tracking-wide">API Gateway</span>
+              <span class="text-[10px] text-[#91918d] dark:text-muted-foreground leading-none mt-1.5 font-medium tracking-wide">AI Gateway</span>
             </div>
           </div>
 

frontend/src/views/shared/Dashboard.vue

@@ -395,8 +395,43 @@
 
     <!-- 趋势图表区域 -->
     <div class="grid grid-cols-1 gap-6 lg:grid-cols-2">
-      <!-- 每日模型成本（堆叠柱状图） -->
-      <Card class="p-5">
+      <!-- 每日使用趋势（折线图）- 普通用户可见 -->
+      <Card
+        v-if="!isAdmin"
+        class="p-5"
+      >
+        <h4 class="mb-3 text-xs font-semibold text-foreground uppercase tracking-wider">
+          每日使用趋势
+        </h4>
+        <div
+          v-if="loadingDaily"
+          class="flex items-center justify-center h-[280px]"
+        >
+          <Skeleton class="h-full w-full" />
+        </div>
+        <div
+          v-else
+          style="height: 280px;"
+        >
+          <LineChart
+            v-if="dailyUsageTrendChartData.labels && dailyUsageTrendChartData.labels.length > 0"
+            :data="dailyUsageTrendChartData"
+            :options="dailyUsageTrendChartOptions"
+          />
+          <div
+            v-else
+            class="flex h-full items-center justify-center text-xs text-muted-foreground"
+          >
+            暂无数据
+          </div>
+        </div>
+      </Card>
+
+      <!-- 每日模型成本（堆叠柱状图）- 仅管理员可见 -->
+      <Card
+        v-if="isAdmin"
+        class="p-5"
+      >
         <h4 class="mb-3 text-xs font-semibold text-foreground uppercase tracking-wider">
           每日模型成本
         </h4>
@@ -424,8 +459,11 @@
         </div>
       </Card>
 
-      <!-- 提供商成本分布（环形图） -->
-      <Card class="p-5">
+      <!-- 提供商成本分布（环形图）- 仅管理员可见 -->
+      <Card
+        v-if="isAdmin"
+        class="p-5"
+      >
         <h4 class="mb-3 text-xs font-semibold text-foreground uppercase tracking-wider">
           提供商成本分布
         </h4>
@@ -452,6 +490,38 @@
           </div>
         </div>
       </Card>
+
+      <!-- 每日模型成本（堆叠柱状图）- 普通用户可见 -->
+      <Card
+        v-if="!isAdmin"
+        class="p-5"
+      >
+        <h4 class="mb-3 text-xs font-semibold text-foreground uppercase tracking-wider">
+          每日模型成本
+        </h4>
+        <div
+          v-if="loadingDaily"
+          class="flex items-center justify-center h-[280px]"
+        >
+          <Skeleton class="h-full w-full" />
+        </div>
+        <div
+          v-else
+          style="height: 280px;"
+        >
+          <BarChart
+            v-if="dailyModelCostChartData.labels && dailyModelCostChartData.labels.length > 0"
+            :data="dailyModelCostChartData"
+            :options="dailyModelCostChartOptions"
+          />
+          <div
+            v-else
+            class="flex h-full items-center justify-center text-xs text-muted-foreground"
+          >
+            暂无数据
+          </div>
+        </div>
+      </Card>
     </div>
 
     <!-- 每日统计 -->
@@ -538,7 +608,10 @@
             <TableHead class="text-center">
               使用模型
             </TableHead>
-            <TableHead class="text-center">
+            <TableHead
+              v-if="isAdmin"
+              class="text-center"
+            >
               使用提供商
             </TableHead>
           </TableRow>
@@ -546,7 +619,7 @@
         <TableBody>
           <TableRow v-if="loadingDaily">
             <TableCell
-              colspan="7"
+              :colspan="isAdmin ? 7 : 6"
               class="text-center py-8"
             >
               <div class="flex items-center justify-center gap-2">
@@ -557,7 +630,7 @@
           </TableRow>
           <TableRow v-else-if="dailyStats.length === 0">
             <TableCell
-              colspan="7"
+              :colspan="isAdmin ? 7 : 6"
               class="text-center py-8 text-muted-foreground text-xs"
             >
               暂无数据
@@ -601,7 +674,10 @@
               <TableCell class="text-center text-xs">
                 {{ stat.unique_models }}
               </TableCell>
-              <TableCell class="text-center text-xs">
+              <TableCell
+                v-if="isAdmin"
+                class="text-center text-xs"
+              >
                 {{ stat.unique_providers }}
               </TableCell>
             </TableRow>
@@ -724,6 +800,7 @@ import {
 } from '@/components/ui'
 import BarChart from '@/components/charts/BarChart.vue'
 import DoughnutChart from '@/components/charts/DoughnutChart.vue'
+import LineChart from '@/components/charts/LineChart.vue'
 import {
   Users,
   Activity,
@@ -1097,6 +1174,91 @@ const providerCostChartOptions = computed<ChartOptions<'doughnut'>>(() => ({
   }
 }))
 
+// 每日使用趋势（折线图）- 普通用户
+const dailyUsageTrendChartData = computed<ChartData<'line'>>(() => {
+  // 管理员不需要此图表，直接返回空数据
+  if (isAdmin.value || dailyStats.value.length === 0) {
+    return { labels: [], datasets: [] }
+  }
+
+  return {
+    labels: dailyStats.value.map(stat => formatDateForChart(stat.date)),
+    datasets: [
+      {
+        label: '请求数',
+        data: dailyStats.value.map(stat => stat.requests),
+        borderColor: 'rgba(59, 130, 246, 0.8)',
+        backgroundColor: 'rgba(59, 130, 246, 0.1)',
+        fill: true,
+        tension: 0.3,
+        yAxisID: 'y'
+      },
+      {
+        label: 'Tokens (K)',
+        data: dailyStats.value.map(stat => stat.tokens / 1000),
+        borderColor: 'rgba(16, 185, 129, 0.8)',
+        backgroundColor: 'rgba(16, 185, 129, 0.1)',
+        fill: true,
+        tension: 0.3,
+        yAxisID: 'y1'
+      }
+    ]
+  }
+})
+
+const dailyUsageTrendChartOptions = computed<ChartOptions<'line'>>(() => {
+  // 管理员不需要此图表
+  if (isAdmin.value) {
+    return {} as ChartOptions<'line'>
+  }
+  return {
+    responsive: true,
+    maintainAspectRatio: false,
+    interaction: {
+      mode: 'index',
+      intersect: false
+    },
+    scales: {
+      x: {
+        ticks: { font: { size: 10 } }
+      },
+      y: {
+        type: 'linear',
+        display: true,
+        position: 'left',
+        title: { display: true, text: '请求数', color: 'rgb(107, 114, 128)', font: { size: 10 } },
+        ticks: { font: { size: 10 } }
+      },
+      y1: {
+        type: 'linear',
+        display: true,
+        position: 'right',
+        title: { display: true, text: 'Tokens (K)', color: 'rgb(107, 114, 128)', font: { size: 10 } },
+        ticks: { font: { size: 10 } },
+        grid: { drawOnChartArea: false }
+      }
+    },
+    plugins: {
+      legend: {
+        display: true,
+        position: 'bottom',
+        labels: { font: { size: 10 }, boxWidth: 12, padding: 8 }
+      },
+      tooltip: {
+        callbacks: {
+          label: (context) => {
+            const value = context.raw as number
+            if (context.dataset.label === 'Tokens (K)') {
+              return `${context.dataset.label}: ${value.toFixed(1)}K`
+            }
+            return `${context.dataset.label}: ${value}`
+          }
+        }
+      }
+    }
+  }
+})
+
 onMounted(async () => {
   checkScreenSize()
   setupResizeObserver()