fix: import unpublished exam rooms and add opt-in school HTML feedback

mobile/lib/features/feedback/feedback_http_sender.dart

@@ -120,10 +120,11 @@ class HttpFeedbackSender implements FeedbackSender {
         throw const FeedbackException('服务器不支持此附件的格式或内容，请移除附件，或换用正常的图片、视频后提交');
       }
       if (response.statusCode == 422 && errorCode == 'validation_error') {
-        if (submission.diagnosticLog != null &&
+        if ((submission.diagnosticLog != null ||
+                submission.diagnosticHtml != null) &&
             result?['detail'] == 'Unexpected file field.') {
           throw const FeedbackException(
-            '反馈服务器尚未更新日志附件协议，请先更新服务器，或取消附带日志后提交。填写内容已保留。',
+            '反馈服务器尚未更新日志或网页附件协议，请先更新服务器，或取消附带排查附件后提交。填写内容已保留。',
           );
         }
         throw const FeedbackException('填写内容未通过服务器校验，请检查必填内容、长度及附件后重新提交');
@@ -206,6 +207,14 @@ class HttpFeedbackSender implements FeedbackSender {
       bytes.add(submission.diagnosticLog!);
       write('\r\n');
     }
+    if (submission.diagnosticHtml != null) {
+      write(
+        '--$boundary\r\nContent-Disposition: form-data; name="diagnostic_html"; filename="TPSchedule-school-page.html"\r\n'
+        'Content-Type: text/html; charset=utf-8\r\n\r\n',
+      );
+      bytes.add(submission.diagnosticHtml!);
+      write('\r\n');
+    }
     write('--$boundary--\r\n');
     return bytes.takeBytes();
   }