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

lib/auth.ts

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+import NextAuth from "next-auth";
+import Credentials from "next-auth/providers/credentials";
+import { prisma } from "./prisma";
+import bcrypt from "bcryptjs";
+import type { Role } from "@/prisma/generated/prisma/client";
+
+export const { handlers, signIn, signOut, auth } = NextAuth({
+  trustHost: true,
+  providers: [
+    Credentials({
+      credentials: {
+        email: { label: "Email", type: "email" },
+        password: { label: "Password", type: "password" },
+      },
+      authorize: async (credentials) => {
+        if (!credentials?.email || !credentials?.password) {
+          return null;
+        }
+
+        const user = await prisma.user.findUnique({
+          where: { email: credentials.email as string },
+        });
+
+        if (!user) {
+          return null;
+        }
+
+        const isPasswordValid = await bcrypt.compare(
+          credentials.password as string,
+          user.password
+        );
+
+        if (!isPasswordValid) {
+          return null;
+        }
+
+        return {
+          id: user.id,
+          email: user.email,
+          username: user.username,
+          role: user.role,
+        };
+      },
+    }),
+  ],
+  callbacks: {
+    jwt: async ({ token, user }) => {
+      if (user) {
+        token.id = user.id;
+        token.username = user.username;
+        token.role = user.role;
+      }
+      return token;
+    },
+    session: async ({ session, token }) => {
+      if (session.user && token) {
+        session.user.id = token.id as string;
+        session.user.username = token.username as string;
+        session.user.role = token.role as Role;
+      }
+      return session;
+    },
+  },
+  pages: {
+    signIn: "/login",
+  },
+  session: {
+    strategy: "jwt",
+  },
+});
+

lib/prisma.ts

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+import { PrismaClient } from "@/prisma/generated/prisma/client";
+import { PrismaBetterSqlite3 } from "@prisma/adapter-better-sqlite3";
+
+const adapter = new PrismaBetterSqlite3({
+  url: process.env.DATABASE_URL || "file:./dev.db",
+});
+
+const globalForPrisma = globalThis as unknown as {
+  prisma: PrismaClient | undefined;
+};
+
+export const prisma =
+  globalForPrisma.prisma ??
+  new PrismaClient({
+    adapter,
+    log:
+      process.env.NODE_ENV === "development"
+        ? ["query", "error", "warn"]
+        : ["error"],
+  });
+
+if (process.env.NODE_ENV !== "production") globalForPrisma.prisma = prisma;