feat: 搭建微信小程序展示端

- 初始化小程序工程配置与类型声明

- 增加首页、律所、律师列表、详情与历史页面

- 补充公共组件、运行时配置与示例素材

frontend_miniprogram/miniprogram/utils/util.ts

@@ -0,0 +1,19 @@
+export const formatTime = (date: Date) => {
+  const year = date.getFullYear()
+  const month = date.getMonth() + 1
+  const day = date.getDate()
+  const hour = date.getHours()
+  const minute = date.getMinutes()
+  const second = date.getSeconds()
+
+  return (
+    [year, month, day].map(formatNumber).join('/') +
+    ' ' +
+    [hour, minute, second].map(formatNumber).join(':')
+  )
+}
+
+const formatNumber = (n: number) => {
+  const s = n.toString()
+  return s[1] ? s : '0' + s
+}