feat: enhance MCP server management and system settings

- Added functionality to save MCP server configurations as templates in the MCP Manager.
- Implemented new hooks for managing system settings including Chinese response, Windows platform, and Codex CLI enhancements.
- Updated API calls to support fetching and toggling system settings.
- Introduced UI components for displaying and managing response language settings and system status.
- Enhanced error handling and notifications for server deletion and template saving actions.
- Updated localization files for new settings and descriptions in English and Chinese.

ccw/frontend/src/components/shared/NavGroup.tsx

@@ -18,6 +18,8 @@ export interface NavItem {
   icon: React.ElementType;
   badge?: number | string;
   badgeVariant?: 'default' | 'success' | 'warning' | 'info';
+  /** When true, only exact path match activates this item (no prefix matching) */
+  end?: boolean;
 }
 
 export interface NavGroupProps {
@@ -54,10 +56,10 @@ export function NavGroup({
         {items.map((item) => {
           const ItemIcon = item.icon;
           const [basePath] = item.path.split('?');
-          // More precise matching: exact match or basePath followed by '/' to avoid parent/child conflicts
-          const isActive =
-            location.pathname === basePath ||
-            (basePath !== '/' && location.pathname.startsWith(basePath + '/'));
+          const isActive = item.end
+            ? location.pathname === basePath
+            : location.pathname === basePath ||
+              (basePath !== '/' && location.pathname.startsWith(basePath + '/'));
 
           return (
             <NavLink
@@ -94,10 +96,10 @@ export function NavGroup({
           {items.map((item) => {
             const ItemIcon = item.icon;
             const [basePath, searchParams] = item.path.split('?');
-            // More precise matching: exact match or basePath followed by '/' to avoid parent/child conflicts
-            const isActive =
-              location.pathname === basePath ||
-              (basePath !== '/' && location.pathname.startsWith(basePath + '/'));
+            const isActive = item.end
+              ? location.pathname === basePath
+              : location.pathname === basePath ||
+                (basePath !== '/' && location.pathname.startsWith(basePath + '/'));
             const isQueryParamActive =
               searchParams && location.search.includes(searchParams);