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

lib/prisma.ts

@@ -0,0 +1,22 @@
+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;