chore: 上线前优化 — 清理调试日志/启用组件按需注入/补全组件声明

- 移除全项目 34 处调试 console.* 输出
- project.config.json: minified true、uploadWithSourceMap false、启用 lazyCodeLoading(requiredComponents 组件按需注入)
- pages/records/records.json 补全 ui-skeleton 组件声明(此前漏声明,WXML 已使用)
- 删除根目录残留 preview-buttons.html

utils/theme.js

@@ -89,7 +89,6 @@ const setTheme = (id) => {
       wx.setStorageSync('user_settings', s)
     } catch (e) {}
   } catch (e) {
-    console.error('Failed to save theme:', e)
   }
   const theme = getThemeById(id)
   _setNavBarColor(theme.primary)