Add 卓米会 mini program and admin server.

Initial commit of the WeChat mini program, Express backend, and admin console.

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/utils/activity.js

@@ -0,0 +1,44 @@
+const media = require('./media')
+
+function openMap(activity) {
+  if (!activity || activity.latitude == null || activity.longitude == null) {
+    wx.showToast({ title: '暂无会场坐标', icon: 'none' })
+    return
+  }
+  wx.openLocation({
+    latitude: Number(activity.latitude),
+    longitude: Number(activity.longitude),
+    name: activity.title,
+    address: activity.address,
+    scale: 16
+  })
+}
+
+function goSignup(activity) {
+  if (!activity || !activity.id) return
+  wx.navigateTo({ url: '/pages/signup/signup?id=' + activity.id })
+}
+
+// Shared links always land on the detail page and carry the sharer's openid for attribution.
+function shareMessage(activity, fallbackId) {
+  const item = activity || {}
+  const openid = wx.getStorageSync('openid') || ''
+  const cover = item.poster || item.cover
+  const message = {
+    title: item.title || '卓米会',
+    path: '/pages/detail/detail?id=' + (item.id || fallbackId || '') + '&sharer=' + openid
+  }
+  if (cover) message.imageUrl = media.absUrl(cover)
+  return message
+}
+
+function toast(error) {
+  wx.showToast({ title: (error && error.message) || '操作失败', icon: 'none' })
+}
+
+module.exports = {
+  openMap: openMap,
+  goSignup: goSignup,
+  shareMessage: shareMessage,
+  toast: toast
+}