feat: add batch backup UI and update SSL verification logic to use form state

gui_app.py

@@ -865,7 +865,7 @@ def batch_jobs():
         vm_names      = request.form.getlist('vms')
         dest          = request.form.get('dest', './backups').strip()
         compress      = 'compress' in request.form
-        no_verify_ssl = session.get('no_verify_ssl', False)
+        no_verify_ssl = 'no_verify_ssl' in request.form
         disk_strategy = request.form.get('disk_strategy', 'all')
         schedule_type = request.form.get('schedule_type', 'now')
         daily_time    = request.form.get('daily_time', '02:00')

templates/batch_job.html

@@ -210,6 +210,11 @@
             <input type="checkbox" id="compress" name="compress" />
             <label for="compress">Compress with zstd (smaller files, slower)</label>
           </div>
+          <div class="form-check">
+            <input type="checkbox" id="no_verify_ssl" name="no_verify_ssl"
+                   {% if session.get('no_verify_ssl') %}checked{% endif %} />
+            <label for="no_verify_ssl">Skip SSL certificate verification</label>
+          </div>
         </div>
       </div>