优化上传日志防抖限制，修复前端失效

app/src/main/assets/print_demo.html

@@ -420,12 +420,23 @@
 
     var lastUploadTime = 0;
     // 上传日志
+    var isUploading = false;
     function callUploadLogs() {
-        var now = Date.now();
-        if (now - lastUploadTime < 30000) {
-            alert("请勿频繁上传，请半分钟后再试");
+        if (isUploading) {
+            alert("正在上传中，请耐心等待（30秒内请勿重复点击）...");
             return;
         }
+        if (window.android && window.android.uploadLogs) {
+            isUploading = true;
+            alert("开始上传日志，请耐心等待...");
+            window.android.uploadLogs();
+            setTimeout(function() {
+                isUploading = false;
+            }, 30000);
+        } else {
+            alert("上传日志接口不可用");
+        }
+    }
         if (window.android && window.android.uploadLogs) {
             lastUploadTime = now;
             alert("开始上传日志...");