fix: resolve frontend lint errors and cleanup types

frontend/src/components/admin/club-management.tsx

@@ -17,10 +17,30 @@ export function ClubManagement() {
   const [isCreating, setIsCreating] = useState(false);
   const [newClub, setNewClub] = useState({ name: '', sportType: 'Tennis', description: '' });
 
+  useEffect(() => {
+    const fetchClubsLocally = async () => {
+      try {
+        const res = await fetch(`${process.env.NEXT_PUBLIC_API_URL}/api/admin/clubs`, {
+          headers: { Authorization: `Bearer ${session?.accessToken}` },
+        });
+        if (res.ok) {
+          const data = await res.json();
+          setClubs(data);
+        }
+      } catch (error) {
+        console.error('Failed to fetch clubs', error);
+      } finally {
+        setLoading(false);
+      }
+    };
+
+    if (session) fetchClubsLocally();
+  }, [session]);
+
   const fetchClubs = async () => {
     try {
       const res = await fetch(`${process.env.NEXT_PUBLIC_API_URL}/api/admin/clubs`, {
-        headers: { Authorization: `Bearer ${(session as any)?.accessToken}` },
+        headers: { Authorization: `Bearer ${session?.accessToken}` },
       });
       if (res.ok) {
         const data = await res.json();
@@ -33,10 +53,6 @@ export function ClubManagement() {
     }
   };
 
-  useEffect(() => {
-    if (session) fetchClubs();
-  }, [session]);
-
   const handleCreate = async (e: React.FormEvent) => {
     e.preventDefault();
     try {
@@ -44,7 +60,7 @@ export function ClubManagement() {
         method: 'POST',
         headers: {
           'Content-Type': 'application/json',
-          Authorization: `Bearer ${(session as any)?.accessToken}`,
+          Authorization: `Bearer ${session?.accessToken}`,
         },
         body: JSON.stringify({
           name: newClub.name,
@@ -67,7 +83,7 @@ export function ClubManagement() {
     try {
       const res = await fetch(`${process.env.NEXT_PUBLIC_API_URL}/api/admin/clubs/${id}`, {
         method: 'DELETE',
-        headers: { Authorization: `Bearer ${(session as any)?.accessToken}` },
+        headers: { Authorization: `Bearer ${session?.accessToken}` },
       });
       if (res.ok) {
         fetchClubs();