fix: address code review feedback

- Fix toggle/load_order handlers to use page-reload (not JSON) responses
- Remove dead jsonResponse helper method from WorkshopModController
- Fix robocopy exit code detection using ROBOCOPY_EXIT: sentinel (not text parsing)
- Fix rsync dry-run change detection using RSYNC_EXIT: sentinel
- Remove agentIdFromRemote() stub; pass agentId directly to triggerSteamCmdDownload() logging
- Fix 'enabled' checkbox default in profile_form to use ($profile['enabled'] ?? 1)
- Add missing error_toggle_failed / error_order_failed lang strings

Agent-Logs-Url: https://github.com/GameServerPanel/GSP/sessions/dbeebd0e-e7a5-469d-8a8c-e63193d1ebb0

Co-authored-by: iaretechnician <2749183+iaretechnician@users.noreply.github.com>

modules/steam_workshop/views/admin/profile_form.php

@@ -135,7 +135,7 @@ $tplVarNote  = $lang['profile_template_vars'] ?? 'Available: {home_id} {agent_id
             </label>
             <label class="sw-checkbox">
                 <input type="checkbox" name="enabled" value="1"
-                       <?php echo (!isset($profile['enabled']) || !empty($profile['enabled'])) ? 'checked' : ''; ?>>
+                       <?php echo ($profile['enabled'] ?? 1) ? 'checked' : ''; ?>>
                 <span><?php echo htmlspecialchars($lang['profile_label_enabled'] ?? 'Profile enabled'); ?></span>
             </label>
         </fieldset>