feat: 看板优化——中文标题+Token消耗+时间段筛选+品牌名统一

- 学员端：LoginPanel/App.vue 描述文案优化，去掉生硬表述
- 后台品牌统一：index.html/App.vue 标题改为'大本营千问千答'
- 看板tab：Dashboard -> 数据看板
- 看板新增：输入Token、输出Token、总Token 统计
- 看板支持按时间段筛选：后端API增加start/end参数，前端加日期选择器
- stats-grid布局从5列调整为4列，响应式改为2列

ai_knowledge_base_v2/apps/admin-web/src/App.vue

@@ -23,6 +23,7 @@ const loading = ref(false);
 
 const loginForm = reactive({ username: "admin", password: "admin123456" });
 const stats = ref<DashboardStats | null>(null);
+const dashboardDateRange = ref<[string, string] | null>(null);
 const users = ref<AdminUser[]>([]);
 const userKeyword = ref("");
 const knowledge = ref<KnowledgeItem[]>([]);
@@ -502,10 +503,15 @@ async function switchMenu(menu: string) {
   await loadCurrentMenu();
 }
 
+async function loadDashboard() {
+  const [start, end] = dashboardDateRange.value ?? ["", ""];
+  stats.value = await api.dashboard(start, end);
+}
+
 async function loadCurrentMenu() {
   loading.value = true;
   try {
-    if (activeMenu.value === "dashboard") stats.value = await api.dashboard();
+    if (activeMenu.value === "dashboard") await loadDashboard();
     if (activeMenu.value === "users") users.value = await api.users(userKeyword.value);
     if (activeMenu.value === "knowledge") knowledge.value = await api.knowledge();
     if (activeMenu.value === "prompt") {
@@ -1036,7 +1042,7 @@ function buildChatQuery() {
       <div class="login-hero-main">
         <div class="login-brand">
           <span>答</span>
-          <strong>大本营答疑助手后台</strong>
+          <strong>大本营千问千答</strong>
         </div>
         <h1>把大本营答疑、知识库和学员运营放在同一个控制台里。</h1>
         <p>统一维护学员名单、开放知识库、模型接入、Agent 调试、问答记录和系统运行参数，方便排查与交接。</p>
@@ -1072,8 +1078,8 @@ function buildChatQuery() {
 
   <main v-else class="admin-shell">
     <aside class="sidebar">
-      <div class="sidebar-title">大本营答疑</div>
-      <button :class="{ active: activeMenu === 'dashboard' }" @click="switchMenu('dashboard')">Dashboard</button>
+      <div class="sidebar-title">大本营千问千答</div>
+      <button :class="{ active: activeMenu === 'dashboard' }" @click="switchMenu('dashboard')">数据看板</button>
       <button :class="{ active: activeMenu === 'users' }" @click="switchMenu('users')">用户管理</button>
       <button :class="{ active: activeMenu === 'knowledge' }" @click="switchMenu('knowledge')">知识库管理</button>
       <button :class="{ active: activeMenu === 'prompt' }" @click="switchMenu('prompt')">Agent 管理</button>
@@ -1093,9 +1099,17 @@ function buildChatQuery() {
 
       <section v-loading="loading" class="content">
         <template v-if="activeMenu === 'dashboard'">
-          <div class="page-head">
-            <h2>Dashboard</h2>
-            <p>核心业务数据概览。</p>
+          <div class="page-head inline">
+            <div><h2>数据看板</h2><p>核心业务数据概览。</p></div>
+            <el-date-picker
+              v-model="dashboardDateRange"
+              type="daterange"
+              range-separator="至"
+              start-placeholder="开始日期"
+              end-placeholder="结束日期"
+              value-format="YYYY-MM-DD"
+              @change="loadDashboard"
+            />
           </div>
           <div class="stats-grid">
             <div class="stat"><span>用户数</span><strong>{{ stats?.userCount ?? 0 }}</strong></div>
@@ -1103,6 +1117,9 @@ function buildChatQuery() {
             <div class="stat"><span>消息数</span><strong>{{ stats?.messageCount ?? 0 }}</strong></div>
             <div class="stat"><span>AI 请求</span><strong>{{ stats?.aiRequestCount ?? 0 }}</strong></div>
             <div class="stat"><span>知识库</span><strong>{{ stats?.knowledgeCount ?? 0 }}</strong></div>
+            <div class="stat"><span>输入 Token</span><strong>{{ stats?.inputToken ?? 0 }}</strong></div>
+            <div class="stat"><span>输出 Token</span><strong>{{ stats?.outputToken ?? 0 }}</strong></div>
+            <div class="stat"><span>总 Token</span><strong>{{ stats?.totalToken ?? 0 }}</strong></div>
           </div>
         </template>
 

ai_knowledge_base_v2/apps/admin-web/src/services/api.ts

@@ -85,7 +85,13 @@ export const api = {
       body: JSON.stringify({ username, password }),
     }),
   profile: () => request<AdminProfile>("/admin/profile"),
-  dashboard: () => request<DashboardStats>("/admin/dashboard"),
+  dashboard: (start?: string, end?: string) => {
+    const params = new URLSearchParams();
+    if (start) params.set("start", start);
+    if (end) params.set("end", end);
+    const qs = params.toString();
+    return request<DashboardStats>(`/admin/dashboard${qs ? "?" + qs : ""}`);
+  },
   users: (keyword = "") => request<AdminUser[]>(`/admin/user/list?keyword=${encodeURIComponent(keyword)}`),
   createUser: (payload: Record<string, unknown>) =>
     request<AdminUser>("/admin/user", { method: "POST", body: JSON.stringify(payload) }),

ai_knowledge_base_v2/apps/admin-web/src/styles.css

@@ -264,7 +264,7 @@ textarea {
 
 .stats-grid {
   display: grid;
-  grid-template-columns: repeat(5, minmax(0, 1fr));
+  grid-template-columns: repeat(4, minmax(0, 1fr));
   gap: 14px;
 }
 
@@ -1002,7 +1002,10 @@ textarea {
     width: 100%;
   }
 
-  .stats-grid,
+  .stats-grid {
+    grid-template-columns: repeat(2, minmax(0, 1fr));
+  }
+
   .chat-summary {
     grid-template-columns: 1fr;
   }

ai_knowledge_base_v2/apps/admin-web/src/types/api.ts

@@ -17,6 +17,9 @@ export interface DashboardStats {
   messageCount: number;
   aiRequestCount: number;
   knowledgeCount: number;
+  inputToken: number;
+  outputToken: number;
+  totalToken: number;
 }
 
 export interface AdminUser {