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/app.json

@@ -0,0 +1,26 @@
+{
+  "pages": [
+    "pages/firm/index",
+    "pages/lawyer-list/index",
+    "pages/lawyer-detail/index",
+    "pages/history/index"
+  ],
+  "window": {
+    "navigationBarTextStyle": "black",
+    "navigationStyle": "custom",
+    "backgroundTextStyle": "light",
+    "backgroundColor": "#f4f4f4"
+  },
+  "style": "v2",
+  "rendererOptions": {
+    "skyline": {
+      "defaultDisplayBlock": true,
+      "disableABTest": true,
+      "sdkVersionBegin": "3.0.0",
+      "sdkVersionEnd": "15.255.255"
+    }
+  },
+  "componentFramework": "glass-easel",
+  "sitemapLocation": "sitemap.json",
+  "lazyCodeLoading": "requiredComponents"
+}