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/pages/lawyer-list/index.json

@@ -0,0 +1,8 @@
+{
+  "usingComponents": {
+    "app-header": "/components/app-header/app-header",
+    "lawyer-card": "/components/lawyer-card/lawyer-card",
+    "filter-bar": "/components/filter-bar/filter-bar",
+    "empty-state": "/components/empty-state/empty-state"
+  }
+}