fix(update): restart panel after regenerating webBasePath to fix login desync

When update.sh regenerates a short webBasePath, it writes the new path to the
database after the panel is already running with the old path loaded in memory.
Without a restart the server keeps serving the old path while the UI shows the new
one, making the new path unreachable.

update.sh

@@ -751,6 +751,8 @@ prompt_and_setup_ssl() {
 }
 
 config_after_update() {
+    local panel_needs_restart=0
+
     echo -e "${yellow}x-ui settings:${plain}"
     ${xui_folder}/x-ui setting -show true
     ${xui_folder}/x-ui migrate
@@ -798,6 +800,7 @@ config_after_update() {
         local config_webBasePath=$(gen_random_string 18)
         ${xui_folder}/x-ui setting -webBasePath "${config_webBasePath}"
         existing_webBasePath="${config_webBasePath}"
+        panel_needs_restart=1
         echo -e "${green}New WebBasePath: ${config_webBasePath}${plain}"
     fi
 
@@ -832,6 +835,11 @@ config_after_update() {
         echo -e "${green}Access URL: https://${cert_domain}:${existing_port}/${existing_webBasePath}${plain}"
         echo -e "${green}═══════════════════════════════════════════${plain}"
     fi
+
+    if [[ "$panel_needs_restart" -eq 1 ]]; then
+        echo -e "${yellow}Restarting panel to apply the new web base path...${plain}"
+        systemctl restart x-ui 2> /dev/null || rc-service x-ui restart 2> /dev/null
+    fi
 }
 
 update_x-ui() {