Merge origin/dev - 충돌 해결

- JWT_SECRET 환경변수 충돌 해결
- origin/dev의 더 안전한 JWT 키 값 채택
- 데이터베이스 커넥터 관련 새로운 기능들과 병합

frontend/components/layout/AppLayout.tsx

@@ -307,7 +307,11 @@ function AppLayoutInner({ children }: AppLayoutProps) {
       <div key={menu.id}>
         <div
           className={`group flex cursor-pointer items-center justify-between rounded-lg px-3 py-2 text-sm font-medium transition-colors hover:cursor-pointer ${
-            isExpanded ? "bg-slate-100 text-slate-900" : "text-slate-600 hover:bg-slate-50 hover:text-slate-900"
+            pathname === menu.url
+              ? "bg-gradient-to-br from-slate-100 to-blue-100/40 text-slate-900 border-l-4 border-blue-500"
+              : isExpanded
+                ? "bg-slate-100 text-slate-900"
+                : "text-slate-600 hover:bg-slate-50 hover:text-slate-900"
           } ${level > 0 ? "ml-6" : ""}`}
           onClick={() => handleMenuClick(menu)}
         >
@@ -328,7 +332,11 @@ function AppLayoutInner({ children }: AppLayoutProps) {
             {menu.children?.map((child: any) => (
               <div
                 key={child.id}
-                className="flex cursor-pointer items-center rounded-lg px-3 py-2 text-sm text-slate-600 transition-colors hover:cursor-pointer hover:bg-slate-50 hover:text-slate-900"
+                className={`flex cursor-pointer items-center rounded-lg px-3 py-2 text-sm transition-colors hover:cursor-pointer ${
+                  pathname === child.url
+                    ? "bg-gradient-to-br from-slate-100 to-blue-100/40 text-slate-900 border-l-4 border-blue-500"
+                    : "text-slate-600 hover:bg-slate-50 hover:text-slate-900"
+                }`}
                 onClick={() => handleMenuClick(child)}
               >
                 {child.icon}