feat: 新增首页、设备、数据、我的页面及底部 tabBar 导航

扩展应用结构，接入底部导航；完善个人信息页提交文案与校验代码风格。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

miniprogram/pages/home/home.ts

@@ -0,0 +1,36 @@
+import { get } from '../../utils/request/index'
+
+/** 将体重数字拆成整数 + 小数字符串 */
+const splitWeight = (weight: number): { int: number; decimal: string } => {
+    const str = weight.toFixed(2)
+    const [intPart, decPart] = str.split('.')
+    return { int: Number(intPart), decimal: `.${decPart}` }
+}
+
+Page({
+    data: {
+        record: null,
+    },
+
+    onShow() {
+        
+    },
+
+    onShareAppMessage(): WechatMiniprogram.Page.ICustomShareContent {
+        return {
+            title: '智能蓝牙秤',
+            path: '/pages/home/home',
+            imageUrl: '/images/share/share.jpg',
+        }
+    },
+
+    /** 跳转历史数据页 */
+    onTapHistory() {
+        wx.switchTab({ url: '/pages/data/data' })
+    },
+
+    /** 跳转设备列表页 */
+    onTapSwitchDevice() {
+        wx.switchTab({ url: '/pages/equipment/equipment' })
+    },
+})