Feat/certificate (#68)

* feat: implement certificate encoding and decoding functionality with AES encryption

* feat: blank cert

* Refactor code structure for improved readability and maintainability

libs/service/src/hooks/index.ts

@@ -5,3 +5,4 @@ export * from './mentors';
 export * from './upload';
 export * from './teams';
 export * from './messages';
+export * from './winners';

libs/service/src/hooks/winners/index.ts

@@ -0,0 +1,43 @@
+import { useQuery } from '@tanstack/react-query';
+import { hackathonApi, HackathonApiResponse } from '../../api/hackathon';
+
+// Query keys
+export const winnerKeys = {
+  all: ['winners'] as const,
+  lists: () => [...winnerKeys.all, 'list'] as const,
+};
+
+// API response types
+interface Team {
+  id: string;
+  name: string;
+  description: string;
+  city: string;
+  visibility: string;
+  logo: string;
+  banner: string;
+  leader_id: string;
+  created_at: string;
+  updated_at: string;
+}
+
+interface Winner {
+  id: string;
+  team_id: string;
+  team: Team;
+  rank: number;
+  prize: string;
+  announced_at: string;
+  created_at: string;
+  updated_at: string;
+}
+
+export const useWinners = () => {
+  return useQuery<HackathonApiResponse<Winner[]>>({
+    queryKey: winnerKeys.lists(),
+    queryFn: async () => {
+      const response = await hackathonApi.get('/winners');
+      return response.data;
+    },
+  });
+};