init: 毛孩子计划 小程序 + Go 后端 + 内嵌后台

- pets-fe: 微信原生小程序（首页/计划/记录/报告/社区/引导），
  服务端驱动、无假数据；弹层改用 scroll-view，打开时隐藏自定义 tabBar
- pets-be: Gin + GORM(MySQL, sundynix_ 前缀) + MinIO，统一响应/分页，
  微信 code2session 登录，provider-neutral AI(DeepSeek)，go:embed React 后台
- 修复：分段选择类型不匹配（字符串 vs 数字）导致选不中

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

pets-be/web/admin/src/pages/Dashboard.tsx

@@ -0,0 +1,39 @@
+import { useEffect, useState } from 'react'
+import { Users, PawPrint, MessageSquare, Activity } from 'lucide-react'
+import { api } from '@/lib/api'
+import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card'
+
+type Stats = { users: number; pets: number; posts: number; records: number }
+
+export default function Dashboard() {
+  const [stats, setStats] = useState<Stats | null>(null)
+  useEffect(() => {
+    api.stats().then(setStats).catch(() => {})
+  }, [])
+
+  const cards = [
+    { label: '用户', value: stats?.users, icon: Users },
+    { label: '宠物', value: stats?.pets, icon: PawPrint },
+    { label: '帖子', value: stats?.posts, icon: MessageSquare },
+    { label: '健康记录', value: stats?.records, icon: Activity },
+  ]
+
+  return (
+    <div>
+      <h1 className="text-2xl font-bold mb-6">概览</h1>
+      <div className="grid grid-cols-2 lg:grid-cols-4 gap-4">
+        {cards.map((c) => (
+          <Card key={c.label}>
+            <CardHeader className="flex-row items-center justify-between pb-2">
+              <CardTitle className="text-sm text-muted-foreground">{c.label}</CardTitle>
+              <c.icon className="h-4 w-4 text-primary" />
+            </CardHeader>
+            <CardContent>
+              <div className="text-3xl font-bold">{c.value ?? '—'}</div>
+            </CardContent>
+          </Card>
+        ))}
+      </div>
+    </div>
+  )
+}