드롭다운이 밑으로 가는 현상 해결

frontend/components/admin/dashboard/data-sources/DatabaseConfig.tsx

@@ -150,7 +150,7 @@ export function DatabaseConfig({ dataSource, onChange }: DatabaseConfigProps) {
                 <SelectTrigger className="w-full">
                   <SelectValue placeholder="커넥션을 선택하세요" />
                 </SelectTrigger>
-                <SelectContent>
+                <SelectContent className="z-[9999]">
                   {connections.map((conn) => (
                     <SelectItem key={conn.id} value={String(conn.id)}>
                       <div className="flex items-center gap-2">