feat(ServerManager): add group selection functionality for servers in ServerManager and ServerGroupCard components

frontend/src/ServerManager.jsx

@@ -284,6 +284,17 @@ function ServerManager() {
     setSelectedServers(newSet);
   };
 
+  const toggleGroupSelection = (servers, selectAll) => {
+    setSelectedServers((prev) => {
+      const next = new Set(prev);
+      servers.forEach((s) => {
+        if (selectAll) next.add(s.ip);
+        else next.delete(s.ip);
+      });
+      return next;
+    });
+  };
+
   const selectAllServers = () => {
     if (selectedServers.size === filteredServers.length) {
       setSelectedServers(new Set());
@@ -838,6 +849,7 @@ function ServerManager() {
                       servers={item.servers}
                       selectedSet={selectedServers}
                       onSelect={toggleServerSelection}
+                      onSelectGroup={toggleGroupSelection}
                       onEdit={handleEdit}
                       onDelete={confirmDelete}
                     />

frontend/src/components/server/ServerGroupCard.jsx

@@ -31,6 +31,7 @@ export default function ServerGroupCard({
   servers,
   selectedSet,
   onSelect,
+  onSelectGroup,
   onEdit,
   onDelete
 }) {
@@ -43,11 +44,15 @@ export default function ServerGroupCard({
   const allSelected = servers.length > 0 && servers.every((s) => selectedSet.has(s.ip));
 
   const handleGroupSelect = () => {
-    servers.forEach((s) => {
-      const selected = selectedSet.has(s.ip);
-      if (allSelected && selected) onSelect?.(s);
-      if (!allSelected && !selected) onSelect?.(s);
-    });
+    if (onSelectGroup) {
+      onSelectGroup(servers, !allSelected);
+    } else {
+      servers.forEach((s) => {
+        const selected = selectedSet.has(s.ip);
+        if (allSelected && selected) onSelect?.(s);
+        if (!allSelected && !selected) onSelect?.(s);
+      });
+    }
   };
 
   return (