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>

server/lib/http.js

@@ -0,0 +1,42 @@
+const crypto = require('crypto')
+
+class HttpError extends Error {
+  constructor(status, message) {
+    super(message)
+    this.status = status
+  }
+}
+
+function uid(prefix) {
+  return `${prefix}${Date.now().toString(36)}${crypto.randomBytes(2).toString('hex')}`
+}
+
+function token() {
+  return crypto.randomBytes(24).toString('hex')
+}
+
+function ok(res, data) {
+  res.json({ ok: true, data })
+}
+
+function fail(res, status, message) {
+  res.status(status).json({ ok: false, message })
+}
+
+// Express 4 does not forward rejected promises to the error handler.
+function wrap(handler) {
+  return (req, res, next) => Promise.resolve(handler(req, res, next)).catch(next)
+}
+
+function str(value, max) {
+  const text = value == null ? '' : String(value).trim()
+  return max ? text.slice(0, max) : text
+}
+
+function has(body, key) {
+  return Object.prototype.hasOwnProperty.call(body || {}, key)
+}
+
+const PHONE_RE = /^1\d{10}$/
+
+module.exports = { HttpError, uid, token, ok, fail, wrap, str, has, PHONE_RE }