chore: add and update gitignore rules for project files

add a comprehensive gitignore file to exclude unnecessary files like dependencies, runtime data, uploads, local configs and debug temporary files

public/tools/plant_home/plant_home.js

@@ -567,6 +567,17 @@ const renderWeather = weather => {
   const adviceText = escapeHtml(weather.advice_text || '暂无建议')
   const weatherIcon = getWeatherIcon(weather.icon)
   
+  // 转换 data_gateway 更新时间为北京时间
+  const formatBeijingTime = (utcStr) => {
+    if (!utcStr) return ''
+    const d = new Date(utcStr.replace(' ', 'T') + '+00:00')
+    if (isNaN(d.getTime())) return ''
+    const pad = n => String(n).padStart(2, '0')
+    return `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}.${pad(d.getMilliseconds())}`
+  }
+  const dataTimestamp = formatBeijingTime(weather._data_gateway_updated_at)
+  const dataSourceLabel = dataTimestamp ? `数据更新：${dataTimestamp}` : ''
+  
   // 检查温度是否已经包含°C，如果没有则添加
   if (temp && !temp.includes('°C')) {
     temp = temp + '°C'
@@ -602,6 +613,7 @@ const renderWeather = weather => {
     
     <div class="weather-advice">
       <div class="advice-text" id="advice-text">${adviceText}</div>
+      ${dataSourceLabel ? `<div class="weather-data-timestamp">${escapeHtml(dataSourceLabel)}</div>` : ''}
       <button class="expand-btn" id="expand-advice-btn">展开</button>
     </div>
   `