后台数据可视化：Recharts 漏斗图、总览页 KPI 卡片和缓存饼图

frontend/components/ops/overview/OverviewPageClient.tsx

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+"use client";
+
+import { useEffect, useState } from "react";
+import { RefreshCcw, TrendingUp, Users, CreditCard, Database, Activity } from "lucide-react";
+import { Card, CardContent } from "@/components/ui/card";
+import { Button } from "@/components/ui/button";
+import { opsApi } from "@/lib/ops-api";
+import Link from "next/link";
+import type { SystemStatusPayload, MembershipsPayload, FunnelPayload } from "@/types/ops";
+import {
+  PieChart, Pie, Cell, ResponsiveContainer, Tooltip,
+} from "recharts";
+
+export function OverviewPageClient() {
+  const [loading, setLoading] = useState(true);
+  const [status, setStatus] = useState<SystemStatusPayload | null>(null);
+  const [memberships, setMemberships] = useState<MembershipsPayload | null>(null);
+  const [funnel, setFunnel] = useState<FunnelPayload | null>(null);
+
+  const load = async () => {
+    setLoading(true);
+    try {
+      const [s, m, f] = await Promise.all([
+        opsApi.systemStatus() as Promise<SystemStatusPayload>,
+        opsApi.memberships() as Promise<MembershipsPayload>,
+        opsApi.funnel(7) as Promise<FunnelPayload>,
+      ]);
+      setStatus(s);
+      setMemberships(m);
+      setFunnel(f);
+    } catch { /* */ }
+    setLoading(false);
+  };
+
+  useEffect(() => { void load(); }, []);
+
+  if (loading) return <div className="text-slate-400 animate-pulse">加载中...</div>;
+
+  const cacheAnalysis = status?.cache?.analysis;
+  const cacheData = cacheAnalysis ? [
+    { name: "命中", value: cacheAnalysis.cache_hits ?? 0, color: "#22c55e" },
+    { name: "未命中", value: cacheAnalysis.cache_misses ?? 0, color: "#f59e0b" },
+    { name: "强制刷新", value: cacheAnalysis.force_refresh_requests ?? 0, color: "#3b82f6" },
+  ].filter((d) => d.value > 0) : [];
+
+  const mems = memberships?.memberships ?? [];
+  const paid = mems.filter((m) => !(m as Record<string, unknown>).is_trial).length;
+  const trials = mems.filter((m) => (m as Record<string, unknown>).is_trial).length;
+
+  const steps = funnel?.steps ?? [];
+  const totalUsers = steps[0]?.count ?? 0;
+  const payingUsers = steps[5]?.count ?? 0;
+  const convRate = totalUsers > 0 ? ((payingUsers / totalUsers) * 100).toFixed(1) : "—";
+
+  return (
+    <div className="space-y-6">
+      <div className="flex items-center justify-between">
+        <h1 className="text-2xl font-bold text-white">总览</h1>
+        <Button variant="outline" size="sm" onClick={load} className="gap-1.5">
+          <RefreshCcw className="h-3.5 w-3.5" /> 刷新
+        </Button>
+      </div>
+
+      {/* KPI cards */}
+      <div className="grid grid-cols-2 lg:grid-cols-5 gap-3">
+        <Link href="/ops/system" className="block">
+          <Card className="hover:bg-white/[0.03] transition-colors cursor-pointer">
+            <CardContent className="p-4">
+              <div className="flex items-center gap-2 mb-2">
+                <Activity className={`h-4 w-4 ${status?.db?.ok ? "text-emerald-400" : "text-red-400"}`} />
+                <span className="text-xs text-slate-500">系统状态</span>
+              </div>
+              <div className="text-lg font-bold text-white">{status?.db?.ok ? "OK" : "—"}</div>
+            </CardContent>
+          </Card>
+        </Link>
+        <Link href="/ops/memberships" className="block">
+          <Card className="hover:bg-white/[0.03] transition-colors cursor-pointer">
+            <CardContent className="p-4">
+              <div className="flex items-center gap-2 mb-2">
+                <Users className="h-4 w-4 text-cyan-400" />
+                <span className="text-xs text-slate-500">付费会员</span>
+              </div>
+              <div className="text-lg font-bold text-cyan-400">{paid}</div>
+              {trials > 0 && <div className="text-xs text-slate-500 mt-0.5">体验 {trials}</div>}
+            </CardContent>
+          </Card>
+        </Link>
+        <Link href="/ops/payments" className="block">
+          <Card className="hover:bg-white/[0.03] transition-colors cursor-pointer">
+            <CardContent className="p-4">
+              <div className="flex items-center gap-2 mb-2">
+                <CreditCard className="h-4 w-4 text-emerald-400" />
+                <span className="text-xs text-slate-500">支付成功</span>
+              </div>
+              <div className="text-lg font-bold text-emerald-400">{payingUsers}</div>
+            </CardContent>
+          </Card>
+        </Link>
+        <Link href="/ops/analytics" className="block">
+          <Card className="hover:bg-white/[0.03] transition-colors cursor-pointer">
+            <CardContent className="p-4">
+              <div className="flex items-center gap-2 mb-2">
+                <TrendingUp className="h-4 w-4 text-blue-400" />
+                <span className="text-xs text-slate-500">转化率</span>
+              </div>
+              <div className="text-lg font-bold text-blue-400">{convRate}%</div>
+            </CardContent>
+          </Card>
+        </Link>
+        <Link href="/ops/training" className="block">
+          <Card className="hover:bg-white/[0.03] transition-colors cursor-pointer">
+            <CardContent className="p-4">
+              <div className="flex items-center gap-2 mb-2">
+                <Database className="h-4 w-4 text-purple-400" />
+                <span className="text-xs text-slate-500">训练数据</span>
+              </div>
+              <div className="text-lg font-bold text-purple-400">
+                {status?.training_data?.truth_records?.row_count ?? "—"}
+              </div>
+            </CardContent>
+          </Card>
+        </Link>
+      </div>
+
+      {/* Cache pie chart */}
+      {cacheData.length > 0 && (
+        <Card>
+          <CardContent className="p-6">
+            <h3 className="text-sm font-bold text-white mb-4">缓存命中率</h3>
+            <div className="flex items-center gap-6">
+              <div className="w-48 h-48">
+                <ResponsiveContainer>
+                  <PieChart>
+                    <Pie
+                      data={cacheData}
+                      cx="50%"
+                      cy="50%"
+                      innerRadius={48}
+                      outerRadius={80}
+                      paddingAngle={2}
+                      dataKey="value"
+                    >
+                      {cacheData.map((d, i) => (
+                        <Cell key={i} fill={d.color} />
+                      ))}
+                    </Pie>
+                    <Tooltip
+                      contentStyle={{ background: "#1e293b", border: "1px solid rgba(255,255,255,0.1)", borderRadius: 8, color: "#e2e8f0" }}
+                    />
+                  </PieChart>
+                </ResponsiveContainer>
+              </div>
+              <div className="space-y-2 text-sm">
+                {cacheData.map((d) => (
+                  <div key={d.name} className="flex items-center gap-2">
+                    <span className="w-3 h-3 rounded-full" style={{ backgroundColor: d.color }} />
+                    <span className="text-slate-400">{d.name}</span>
+                    <span className="text-white font-bold ml-2">{d.value}</span>
+                  </div>
+                ))}
+                {cacheAnalysis?.hit_rate != null && (
+                  <div className="pt-2 border-t border-white/10">
+                    <span className="text-slate-400">命中率 </span>
+                    <span className="text-emerald-400 font-bold">{(cacheAnalysis.hit_rate * 100).toFixed(1)}%</span>
+                  </div>
+                )}
+              </div>
+            </div>
+          </CardContent>
+        </Card>
+      )}
+    </div>
+  );
+}