fix: 修复 noDataWatchdogTask 潜在的内存泄漏问题

在 Runnable 中添加生命周期检查，防止 Activity 销毁后任务继续执行。

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

app/src/main/java/com/shuwei/intelligent/shelves/activity/HomeActivity.kt

@@ -273,6 +273,9 @@ class HomeActivity : BaseActivity() {
      */
     private val noDataWatchdogTask = object : Runnable {
         override fun run() {
+            // 生命周期检查，防止 Activity 销毁后继续执行
+            if (isFinishing || isDestroyed) return
+
             val elapsed = System.currentTimeMillis() - lastDataReceivedTime
             if (elapsed >= 5 * 60 * 1000L) {
                 if (noDataWarningDialog == null) {