feat(前端): 产品卡片双生产总天数 + 效能分析设备总天数按钮切换

- 产品管理卡片同时显示「生产总天数(自然天)」和「生产总天数(工作日)」
- 效能分析页新增「设备生产总天数」统计卡片(设备数/平均/最长)，顶部按钮切换 自然天/工作日
- 顺手修复 AnalyticsDashboard Tabs onChange 类型错误

frontend/src/pages/admin/AdminProductsPage.tsx

@@ -250,7 +250,8 @@ export default function AdminProductsPage() {
                                 return <span className={`rounded-md px-1.5 py-0.5 font-bold ${cls}`}>{formatDuration(h)}</span>;
                               })()}
                             </div>
-                            <InfoRow icon={CalendarDays} label="生产总天数" value={formatProductionDays(p.created_at)} />
+                            <InfoRow icon={CalendarDays} label="生产总天数" value={`${p.production_days ?? formatProductionDays(p.created_at)} 天`} />
+                            <InfoRow icon={CalendarDays} label="生产总天数(工作日)" value={p.production_days_workdays != null ? `${p.production_days_workdays} 天` : "—"} />
                             <InfoRow icon={Clock} label="创建时间" value={new Date(p.created_at).toLocaleDateString("zh-CN")} />
                           </div>
                           <div className="border-t border-gray-50 px-4 py-3">

frontend/src/pages/admin/AnalyticsDashboard.tsx

@@ -2,8 +2,8 @@
  *  个人能力图谱：X 轴 = 设备身份证，单机耗时对比，支持点击柱子下钻备注弹窗（含照片）。 */
 import { useCallback, useEffect, useMemo, useRef, useState } from "react";
 import { useSearchParams } from "react-router-dom";
-import { DatePicker, Tabs, Select, Button, Empty, Modal, Timeline, Image } from "antd";
-import { Users, GitBranch, RefreshCw, Loader2, AlertCircle } from "lucide-react";
+import { DatePicker, Tabs, Select, Button, Empty, Modal, Timeline, Image, Radio } from "antd";
+import { Users, GitBranch, RefreshCw, Loader2, AlertCircle, CalendarDays } from "lucide-react";
 import dayjs, { type Dayjs } from "dayjs";
 import type { EChartsCoreOption } from "echarts/core";
 import "dayjs/locale/zh-cn";
@@ -88,6 +88,8 @@ export default function AnalyticsDashboard() {
   const [capabilityLoading, setCapabilityLoading] = useState(false);
   const [flow, setFlow] = useState<FlowResponse | null>(null);
   const [flowLoading, setFlowLoading] = useState(false);
+  // 📅 设备生产总天数口径：自然天 / 工作日
+  const [totalDaysMode, setTotalDaysMode] = useState<"natural" | "workdays">("natural");
   const [error, setError] = useState<string | null>(null);
 
   // ─── 弹窗下钻：设备备注（all=true 表示流转图点击，展示全部） ──
@@ -673,10 +675,57 @@ export default function AnalyticsDashboard() {
         </div>
       )}
 
+      {/* 📅 设备生产总天数（自然天 / 工作日切换） */}
+      <div className="rounded-xl bg-white p-4 shadow-sm">
+        <div className="mb-3 flex items-center justify-between">
+          <h3 className="flex items-center gap-2 text-sm font-semibold text-gray-700">
+            <CalendarDays className="h-4 w-4 text-emerald-500" /> 📅 设备生产总天数
+          </h3>
+          <Radio.Group
+            value={totalDaysMode}
+            onChange={e => setTotalDaysMode(e.target.value)}
+            size="small"
+            optionType="button"
+            buttonStyle="solid"
+          >
+            <Radio.Button value="natural">自然天</Radio.Button>
+            <Radio.Button value="workdays">工作日</Radio.Button>
+          </Radio.Group>
+        </div>
+        {flowLoading && !flow ? (
+          <div className="flex items-center justify-center py-8">
+            <Loader2 className="h-5 w-5 animate-spin text-emerald-500" />
+          </div>
+        ) : !flow || flow.devices.length === 0 ? (
+          <div className="py-8 text-center text-sm text-gray-400">暂无设备数据，请选择筛选条件后查询</div>
+        ) : (
+          <div className="grid gap-3 sm:grid-cols-3">
+            <div>
+              <p className="text-xs text-gray-400">设备数</p>
+              <p className="text-2xl font-bold text-gray-800">{flow.devices.length}<span className="text-sm font-normal text-gray-400"> 台</span></p>
+            </div>
+            <div>
+              <p className="text-xs text-gray-400">{totalDaysMode === "natural" ? "平均生产总天数（自然天）" : "平均生产总天数（工作日）"}</p>
+              <p className="text-2xl font-bold text-emerald-600">
+                {Math.round(flow.devices.reduce((s, d) => s + (totalDaysMode === "natural" ? d.total_days : d.total_workdays), 0) / flow.devices.length)}
+                <span className="text-sm font-normal text-gray-400"> 天</span>
+              </p>
+            </div>
+            <div>
+              <p className="text-xs text-gray-400">最长生产周期（{totalDaysMode === "natural" ? "自然天" : "工作日"}）</p>
+              <p className="text-2xl font-bold text-blue-600">
+                {Math.max(...flow.devices.map(d => totalDaysMode === "natural" ? d.total_days : d.total_workdays))}
+                <span className="text-sm font-normal text-gray-400"> 天</span>
+              </p>
+            </div>
+          </div>
+        )}
+      </div>
+
       {/* 主体：两个可视化区块 */}
       <Tabs
         activeKey={activeTab}
-        onChange={setActiveTab}
+        onChange={(k) => setActiveTab(k as "capability" | "flow")}
         items={[
           {
             key: "capability",