Add database and Prisma configurations, enhance event and leaderboard components with API integration, and update navigation for session management

types/next-auth.d.ts

@@ -0,0 +1,27 @@
+import { Role } from "@/prisma/generated/prisma/client";
+import "next-auth";
+
+declare module "next-auth" {
+  interface User {
+    id: string;
+    username: string;
+    role: Role;
+  }
+
+  interface Session {
+    user: {
+      id: string;
+      email: string;
+      username: string;
+      role: Role;
+    };
+  }
+}
+
+declare module "next-auth/jwt" {
+  interface JWT {
+    id: string;
+    username: string;
+    role: Role;
+  }
+}